CodeInvestigator 0.7.4
CodeInvestigator version 0.7.4 was released on March 3. This is a bug fix release. It fixes a problem with non-ascii characters. Strings with non-ascii characters are now saved as part of the recording and can be used in searches. CodeInvestigator is a tracing tool for Python programs. Running a program through CodeInvestigator creates a recording. Program flow, function calls, variable values and conditions are all stored for every line the program executes. The recording is then viewed with an interface consisting of the code. The code can be clicked: A clicked variable displays its value, a clicked loop displays its iterations. You read code, and have at your disposal all the run time details of that code. A computerized desk check tool and another way to learn about your program. http://sourceforge.net/project/showfiles.php?group_id=183942 -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: Snackages [Re: is there enough information?]
Speak not of Wendy's -- they moved into town in my college days... The hot and juicy was commonly taken to mean: patty dipped in pan drippings, then nuked in microwave... And any CompSci person could figure out that the 256 different ways meant one had access to a tray of 8 condiments, and had any combination of on or off for each... 8 condiments, let's see: ketchup, mayo, mustard, pickle, onion, lettuce, tomato, cheese? I went once to Wendy's, and couldn't finish my sandwich. It was ho-rri-ble. It was not a surprise when they closed all their restaurants in Argentina and leave the country, after being here for less than 4 years. You have _got_ to be kidding me. Where do you guys live? In California (at least, Silicon Valley and Sacramento area), Wendy's and In-N-Out are the only fast food chains that sell anything that taste like real hamburgers. Way, _way_ better than the cardboard stuff at McD's and BK. Though Carl's Jr's $6 burgers are okay. And Carl's has _terrific_ ice cream shakes, whereas Wendy's has... frosted dairy desserts. :p Great. Now I'm hungry. I'm not a Wendy's fan but In-N-Out definitely rocks! :) -- http://mail.python.org/mailman/listinfo/python-list
write float to Excel with pyExcelerator write
I use pyExcelerator to generat Excel files in my project. it works good before I found this bug: run this code: from pyExcelerator import * wb = Workbook() ws = wb.add_sheet(sheet) for i in xrange(1): ws.write(i,0, 10474224.6) wb.save(r'd:\error_float.xls') open d:\error_float.xls with M$ Excle you'll find the number in the cell is -263193.64 not 10474224.6 why? some body help me please. PS: I'm not good at English, I hope you can understand what i said. :) Thx -- About Cyril.Liu --- Cyril 是一个程序员, 现在是个穷光蛋, 他常常跟自己说:我�找���有理想牛仔仔 -- http://mail.python.org/mailman/listinfo/python-list
How to subclass ints to prevent comparisons?
I'm trying to create a type-safe subclass of int (SpecialInt) such that instances of the class can only be compared with ints, longs, and other subclasses of SpecialInt -- I do not want them to be compared with floats, bools, or strings, which the native int implementation supports. Obviously, I could overload __lt_, __eq__, __le__, etc, and write a bunch of boilerplate code. Should this code throw an exception if the types are not comparable? What would I lose by doing that? The native implementation of int goes to great lengths to allow illogical comparisons such as the one below. import xml as x x module 'xml' from 'c:\python25\lib\xml\__init__.pyc' x4 True x4 False - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This message is intended only for the personal and confidential use of the designated recipient(s) named above. If you are not the intended recipient of this message you are hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and should not be regarded as an offer to sell or as a solicitation of an offer to buy any financial product, an official confirmation of any transaction, or as an official statement of Lehman Brothers. Email transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice. IRS Circular 230 Disclosure: Please be advised that any discussion of U.S. tax matters contained within this communication (including any attachments) is not intended or written to be used and cannot be used for the purpose of (i) avoiding U.S. tax related penalties or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. -- http://mail.python.org/mailman/listinfo/python-list
write float to Excel with pyExcelerator write
I use pyExcelerator to generat Excel files in my project. it works good before I found this bug: run this code: from pyExcelerator import * wb = Workbook() ws = wb.add_sheet(sheet) for i in xrange(1): ws.write(i,0, 10474224.6) wb.save(r'd:\error_float.xls') open d:\error_float.xls with M$ Excle you'll find the number in the cell is -263193.64 not 10474224.6 why? some body help me please. PS: I'm not good at English, I hope you can understand what i said. :) Thx -- About Cyril.Liu --- Cyril 是一个程序员, 现在是个穷光蛋, 他常常跟自己说:我�找���有理想牛仔仔 -- http://mail.python.org/mailman/listinfo/python-list
Trouble using XML Reader
Hello,
I'm using XML Reader (xml.sax.xmlreader.XMLReader) to create an rss reader.
I can parse the file but am unsure how to extract the elements I require.
For example: For each item element I want the title and description.
I have some stub code; I want to create a list of objects which include a
title and description.
I have the following code (a bit hacked up):
import sys
from xml.sax import make_parser
from xml.sax import handler
class rssObject(object):
objectList=[]
def addObject(self,object):
rssObject.objectList.append(object)
class rssObjectDetail(object):
title =
content =
class SimpleHandler(handler.ContentHandler):
def startElement(self,name,attrs):
print name
def endElement(self,name):
print name
def characters(self,data):
print data
class SimpleDTDHandler(handler.DTDHandler):
def notationDecl(self,name,publicid,systemid):
print Notation: , name, publicid, systemid
def unparsedEntityDecl(self,name,publicid,systemid):
print UnparsedEntity: , name, publicid, systemid, ndata
p= make_parser()
c = SimpleHandler()
p.setContentHandler(c)
p.setDTDHandler(SimpleDTDHandler())
p.parse('topstories.xml')
And am using this xml file:
?xml version=1.0?
rss version=2.0
channel
titleStuff.co.nz - Top Stories/title
linkhttp://www.stuff.co.nz/link
descriptionTop Stories from Stuff.co.nz. New Zealand, world, sport,
business amp; entertainment news on Stuff.co.nz. /description
languageen-nz/language
copyrightFairfax New Zealand Ltd./copyright
ttl30/ttl
image
url/static/images/logo.gif/url
titleStuff News/title
linkhttp://www.stuff.co.nz/link
/image
item id=4423924 count=1
titlePrince Harry apos;wants to live in Africaapos;/title
linkhttp://www.stuff.co.nz/4423924a10.html?source=RSStopstories_20080303
/link
descriptionFor Prince Harry it must be the ultimate dark irony: to be in
such a privileged position and have so much opportunity, and yet be unable
to fulfil a dream of fighting for the motherland./description
authorEDMUND TADROS/author
guid isPermaLink=falsestuff.co.nz/4423924/guid
pubDateMon, 03 Mar 2008 00:44:00 GMT/pubDate
/item
/channel
/rss
Is there something I'm missing? I can't figure out how to correctly
interpret the document using the SAX parser. I'm sure I;'m missing something
obvious :)
Any tips or advice would be appreciated! Also advice on correctly
implementing what I want to achieve would be appreciated as using
objectList=[] in the ContentHandler seems like a hack.
Thanks!
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Regex loop question
Hi Experts,
I've written a peice of code that works fine and fits, and passes
values into a peice of SPSS code, the problem is that it is not
dynamic, and so i though about how i can make it dynamic, (other code
may not have upto 10 some may have more) and came up with regex for an
idea, but i can't seem to make it work, can anyone offer any advice?
Below is current working code
time_variables = {ActivityTime: Activity_Time,
ExposureTime_Last:Exposure_Time_1,
ExposureTime_Last2:Exposure_Time_2,
ExposureTime_Last3:Exposure_Time_3,
ExposureTime_Last4:Exposure_Time_4,
ExposureTime_Last5:Exposure_Time_5,
ExposureTime_Last6:Exposure_Time_6,
ExposureTime_Last7:Exposure_Time_7,
ExposureTime_Last8:Exposure_Time_8,
ExposureTime_Last9:Exposure_Time_9,
ExposureTime_Last10:Exposure_Time_10}
for Var in time_variables.keys():
time_manips = (COMPUTE %s = SUBSTR(%s,(INDEX(%s,'T'))+1) .
COMPUTE %s = number(%s, TIME8).
VARIABLE LABEL %s.
VARIABLE LEVEL %s (SCALE).
FORMATS %s (TIME8).
VARIABLE WIDTH %s (8).
EXECUTE.) %(Var, Var,
Var,time_variables[Var],Var,time_variables[Var],time_variables[Var],time_variables[Var],time_variables[Var])
spss.Submit(time_manips)
Now to make it dynamic i've gone for the following...
reg_time = re.compile(^ExposureTime_Last([0-9]*)$)
reg_Activity = re.compile(^ActivityTime)
for Var in time_variables.keys():
if reg_time.match(Var):
match = reg_time.match(Var)
E_time = Exposure_Time_%s % match.groups()[0]
else:
match = reg_time.match(Var)
match.groups()[0] = Activity_Time
time_manips = (COMPUTE %s = SUBSTR(%s,(INDEX(%s,'T'))+1) .
COMPUTE %s = number(%s, TIME8).
VARIABLE LABEL %s.
VARIABLE LEVEL %s (SCALE).
FORMATS %s (TIME8).
VARIABLE WIDTH %s (8).
EXECUTE.) %(Var, Var,
Var,time_variables[Var],Var,time_variables[Var],time_variables[Var],time_variables[Var],time_variables[Var])
print(time_manips)
All help welcome, or if a different approach is better please let me
know
Mike
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Re: First post from a Python newbiw
Steve Turner wrote: I finally decided to have a go with Python and am working through the tutorial. Great! On my old BBC Computer [...] These were nice machines... In Python I thought I could do this with: a=[0,0,0] b=[a,a,a] b [[0, 0, 0], [0, 0, 0], [0, 0, 0]] b[1][1]='foo' b [[0, 'foo', 0], [0, 'foo', 0], [0, 'foo', 0]] I can understand why as b[1][1]='foo' is actually changing a[1] Apart from doing something like a=[0,0,0] b=[0,0,0] c=[0,0,0] d=[a,b,c] is there a better way of creating d?? It's a FAQ: http://www.python.org/doc/faq/programming/#how-do-i-create-a-multidimensional-list -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: write float to Excel with pyExcelerator write
Cyril.Liu wrote: I use pyExcelerator to generat Excel files in my project. it works good before I found this bug: run this code: from pyExcelerator import * wb = Workbook() ws = wb.add_sheet(sheet) for i in xrange(1): ws.write(i,0, 10474224.6) wb.save(r'd:\error_float.xls') open d:\error_float.xls with M$ Excle you'll find the number in the cell is -263193.64 not 10474224.6 why? some body help me please. It's probably a bug in pyExcelerator: http://sourceforge.net/tracker/index.php?func=detailaid=1596642group_id=134081atid=730643 There's a patch by John Machin, http://sourceforge.net/tracker/index.php?func=detailaid=1618443group_id=134081atid=730645 and the problem should be fixed in subversion. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: RELEASED Python 2.6a1 and 3.0a3
On 2 Mar, 10:02, Kay Schluehr [EMAIL PROTECTED] wrote: On 2 Mrz., 06:53, Ben Finney [EMAIL PROTECTED] wrote: One of the stated goals of the migration is that the '2to3' program will only migrate Python 2.6 code - Python 3.0 code. Yes, I know. Why? The master said so isn't an entirely satisfying answer. What are the *technical reasons* that make it hard to apply '2to3' directly on Python 2.4 or Python 2.5? I imagine that in Python 2.6 there are some semantic changes (conveniences, really), plus some expansion of the language syntax to overlap with Python 3, both of which let the 2to3 tool work as intended. Obviously 2to3 doesn't do too much complicated stuff, and I imagine (or have deduced from what I've heard) that you have to write code that is obvious to the tool so that it can translate it correctly. Perhaps 2.5 and earlier don't permit such obvious code to be written. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Beautiful Code in Python?
js a écrit : Hi, Have you ever seen Beautiful Python code? Zope? Django? Python standard lib? or else? Please tell me what code you think it's stunning. FormEncode has some very interesting parts IMHO. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can one get for x in y to work for non builtin classes?
On 2008-03-02 15:06, Preben Randhol wrote:
Hi
I'm making a kind of ordered dictionary class. It is not exactly a
dictionary, but it uses a list and dictionary to store the data.
Something like:
class dbase(list):
'''Database class keeping track of the order and data'''
def __init__(self):
self.__data = {}
self.__order = []
self.__uniq_id = 0
I'm just wondering if it is possible to get my class to work so that if
one do:
d=dbase()
d.append(Data)
d.append([1,2])
one can do like this to iterate over the data.
for x in d:
...
I'm looking at the list class but I don't quite understand from pydoc
which __ __ methods I have to implement to get the above to work.
The easiest is to implement an iterator which then get's
returned by the .__iter__() method.
http://www.python.org/doc/lib/typeiter.html
It's also possible to implement .__getitem__() and .__len__()
methods and have Python create an iterator on-the-fly. That's
how Python used to work before iterators were added to the
language.
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eGenix.com
Professional Python Services directly from the Source (#1, Mar 03 2008)
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Re: Can one get for x in y to work for non builtin classes?
On Mon, 03 Mar 2008 12:17:39 +0100, M.-A. Lemburg wrote: It's also possible to implement .__getitem__() and .__len__() methods and have Python create an iterator on-the-fly. That's how Python used to work before iterators were added to the language. A suitable `__getitem__()` is enough. The end will be signaled by an `IndexError`. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex loop question
Mike P wrote:
Hi Experts,
I've written a peice of code that works fine and fits, and passes
values into a peice of SPSS code, the problem is that it is not
dynamic, and so i though about how i can make it dynamic, (other code
may not have upto 10 some may have more) and came up with regex for an
idea, but i can't seem to make it work, can anyone offer any advice?
Below is current working code
time_variables = {ActivityTime: Activity_Time,
ExposureTime_Last:Exposure_Time_1,
ExposureTime_Last2:Exposure_Time_2,
ExposureTime_Last3:Exposure_Time_3,
ExposureTime_Last4:Exposure_Time_4,
ExposureTime_Last5:Exposure_Time_5,
ExposureTime_Last6:Exposure_Time_6,
ExposureTime_Last7:Exposure_Time_7,
ExposureTime_Last8:Exposure_Time_8,
ExposureTime_Last9:Exposure_Time_9,
ExposureTime_Last10:Exposure_Time_10}
for Var in time_variables.keys():
time_manips = (COMPUTE %s = SUBSTR(%s,(INDEX(%s,'T'))+1) .
COMPUTE %s = number(%s, TIME8).
VARIABLE LABEL %s.
VARIABLE LEVEL %s (SCALE).
FORMATS %s (TIME8).
VARIABLE WIDTH %s (8).
EXECUTE.) %(Var, Var,
Var,time_variables[Var],Var,time_variables[Var],
time_variables[Var],time_variables[Var],time_variables[Var])
spss.Submit(time_manips)
Now to make it dynamic i've gone for the following...
reg_time = re.compile(^ExposureTime_Last([0-9]*)$)
reg_Activity = re.compile(^ActivityTime)
for Var in time_variables.keys():
if reg_time.match(Var):
match = reg_time.match(Var)
E_time = Exposure_Time_%s % match.groups()[0]
else:
match = reg_time.match(Var)
match.groups()[0] = Activity_Time
time_manips = (COMPUTE %s = SUBSTR(%s,(INDEX(%s,'T'))+1) .
COMPUTE %s = number(%s, TIME8).
VARIABLE LABEL %s.
VARIABLE LEVEL %s (SCALE).
FORMATS %s (TIME8).
VARIABLE WIDTH %s (8).
EXECUTE.) %(Var, Var,
Var,time_variables[Var],Var,time_variables[Var],time_variables[Var],
time_variables[Var],time_variables[Var])
print(time_manips)
All help welcome, or if a different approach is better please let me
know
I'd clean up the original code a bit rather than introducing another source
of errors (the regexes):
# no warranties
time_variables = [
(ActivityTime, Activity_Time),
(ExposureTime_Last,Exposure_Time_1)]
time_variables.extend((ExposureTime_Last%d % i, Exposure_Time_%d % i)
for i in range(2, 11))
for key, value in time_variables:
time_manips = COMPUTE %(key)s = SUBSTR(%(key)s
(INDEX(%(key)s,'T'))+1) .
COMPUTE %(value)s = number(%(key)s, TIME8).
VARIABLE LABEL %(value)s.
VARIABLE LEVEL %(value)s (SCALE).
FORMATS %(value)s (TIME8).
VARIABLE WIDTH %(value)s (8).
EXECUTE. % dict(key=key, value=value)
spss.Submit(time_manips)
It might be even better to move the logic into SPSS and to replace the
numerical suffices with array indices (if supported), but I can't help you
with that.
Peter
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Delete hidden files on unix
How can I delete hidden files on unix with python, i.e I want to do equivalent of rm .lock* -- http://mail.python.org/mailman/listinfo/python-list
Python logging: Retrieving the last log record from a handler
Hi,
I'm using a log hierarchy in my application, and sometimes I find myself
wanting to retrieve the latest log message written to the root logger.
(Typical usage might be displaying the latest log message at all times in a
GUI).
The only way I've found how to solve this, is by adding a custom loghandler:
---
class LastRecordHandler(logging.Handler):
def __init__(self):
logging.Handler.__init__(self)
self.lastRecord = None
def emit(self, record):
self.lastRecord = record
def getRecord(self):
return self.lastRecord.getMessage()
---
I will be fairly surprised if this functionality is not already built-in for
the default logging handlers, but so far I've been unable to figure out how
to pull it of without the custom loghandler above.
The kind of functionality I'm looking for is something like:
self.log = logging.getLogger('GUI')
(...)
lastRecord = self.log.getLastRecord()
# Display lastRecord in GUI
Is this possible in some way, or do I need to extend the default logging
handlers in order to archieve this?
Thanks,
Frank
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Re: Delete hidden files on unix
loial wrote: How can I delete hidden files on unix with python, i.e I want to do equivalent of rm .lock* for fn in glob.glob(.lock*): ... os.remove(fn) ... Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: write float to Excel with pyExcelerator write
On Mar 1, 5:59 pm, Cyril.Liu [EMAIL PROTECTED] wrote: I use pyExcelerator to generat Excel files in my project. it works good before I found this bug: run this code: from pyExcelerator import * wb = Workbook() ws = wb.add_sheet(sheet) for i in xrange(1): ws.write(i,0, 10474224.6) wb.save(r'd:\error_float.xls') open d:\error_float.xls with M$ Excle you'll find the number in the cell is -263193.64 not 10474224.6 why? The author assumed unsigned integers instead of signed integers. 1047422460 - 2**30 -26319364 See the following, previously posted here: http://mail.python.org/pipermail/python-list/2007-May/441633.html Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] [ANN] Python 2.3.7 and 2.4.5, release candidate 1
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Mar 3, 2008, at 1:48 AM, Martin v. Löwis wrote: But it would be really nice if the configure fix for 2.5 was backported to 2.4.5 since Zope is still on 2.4 and Mac OS X skipped system builds for 2.4 going direct from 2.3 - 2.5. Yes, it would be very nice if this worked out of the box on Mac OS X 10.5.2. It's definitely a surprise for those of us who built our 2.4.4 on Mac OS X 10.4.x. I can put a notice in the release notes, but I definitely won't change it to work out of the box. If 2.4.4 compiled out of the box on this box, it would have been a regression and would have to be fixed. IIUC, 2.4.4 won't compile on 10.5, either, and Python 2.4.5 will have no code to port it to new platforms. Can you also add a note to the 2.3 and 2.4 web pages? - -Barry -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.8 (Darwin) iQCVAwUBR8vsPHEjvBPtnXfVAQJVpgP5AbRU+BENEa7fv7vGUykjtQRftaF6ATQz yTo9018UiQZ20bFv2PIvgHltsET1ksTuieSdDjGbQ3rGu3vo1tldiGYxUQJgi++C q8ntOyLUo+nHSlKm11TTyMiNX4igl+X0bes5PlgJZbWOnw0vBvWbVRrwgMUsJqfi ox/d8+2jWc4= =HLja -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: RELEASED Python 2.6a1 and 3.0a3
On Mar 1, 10:53 pm, Kay Schluehr [EMAIL PROTECTED] wrote: On 1 Mrz., 19:51, Barry Warsaw [EMAIL PROTECTED] wrote: Python 2.6 is not only the next advancement in the Python 2 series, it is also a transitionary release, helping developers begin to prepare their code for Python 3.0. Isn't this a silly idea? People have to migrate from 2.5 or lower releases to Python 2.6 first just to migrate to Python 3.0? What are the inherent / technical reasons that prevent migration directly from 2.5 to 3.0? Not only that, you have to wait for your library providers to migrate first (PyOpenGL, PyGame, PIL, etc for me). Hopefully this is the last quantum shift for a while. -- http://mail.python.org/mailman/listinfo/python-list
Re: RELEASED Python 2.6a1 and 3.0a3
On Mar 1, 10:53 pm, Kay Schluehr [EMAIL PROTECTED] wrote: On 1 Mrz., 19:51, Barry Warsaw [EMAIL PROTECTED] wrote: Python 2.6 is not only the next advancement in the Python 2 series, it is also a transitionary release, helping developers begin to prepare their code for Python 3.0. Isn't this a silly idea? People have to migrate from 2.5 or lower releases to Python 2.6 first just to migrate to Python 3.0? What are the inherent / technical reasons that prevent migration directly from 2.5 to 3.0? Not only that, you have to wait for your library providers to migrate first (PyOpenGL, PyGame, PIL, etc for me). Hopefully this is the last quantum shift for a while. -- http://mail.python.org/mailman/listinfo/python-list
Re: Delete hidden files on unix
loial [EMAIL PROTECTED] wrote:
How can I delete hidden files on unix with python, i.e I want to do
equivalent of
rm .lock*
Here is one way to do it:
import os, glob
for filename in glob.glob('.lock*'):
os.unlink(filename)
Alternatively, you could also do this:
import os
os.system('rm .lock*')
cu
Philipp
--
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Lehrstuhl f. Genomorientierte Bioinformatik
Technische Universität München
http://mips.gsf.de/staff/pagel
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Cant run application as ./myapp.py
Hello Guys, I've got an application here which for some reason won't start using the following syntax from the command line: Cd /mydirectory ./MyApplication.py I have to run this as a fully qualified python launch such as: Cd /mydirectory python MyApplication.py This is a little bit confusing to me as I have other applications which run just fine using the ./somthing.py syntax. Is there any reason why this doesn't work? Cheers, Robert -- http://mail.python.org/mailman/listinfo/python-list
Re: is there enough information?
On Tue, 26 Feb 2008 21:45:24 -0800, Dennis Lee Bieber [EMAIL PROTECTED] wrote: [snip] Threads, in Python, are good for parallel processing of items that tend to be I/O bound -- that is, stuff that blocks on lots of I/O calls allowing other threads to execute until they block too. Due to the GIL in the common Python implementation, threading is not useful for number-crunching (CPU bound) processing. Now, there is a very vocal group that recommend Twisted style asynchronous call-backs for everything in the world... But I think that group tends to forget that Windows I/O is incompatible with the low-level select() call often used to do parallel I/O -- leaving it only useful for the network socket I/O, but not local file I/O processing. I'm not sure, but you seem to be implying that the only way to use Windows' asynchronous I/O APIs is with threads. Actually, it is possible (and Twisted allows you) to use these as well without writing a threaded application. Perhaps you think it would be better to use them with threads, but that's certainly not the _only_ way to use them as you implied. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
compiling plpython compilation error
Hi all. Im having a hard time trying to compile the plpython package. This is the error make gives me: [EMAIL PROTECTED]:/usr/local/src/postgresql-8.2.5/src/pl/plpython make gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Winline -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fpic -shared -Wl,-soname,libplpython.so.0 plpython.o -L/usr/lib/python2.5/config -L../../../src/port -lpython2.5 -lpthread -ldl -lutil -lm -Wl,-rpath,'/usr/lib/python2.5/config' -o libplpython.so.0.0 /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/ld: /usr/lib/python2.5/config/libpython2.5.a(abstract.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC /usr/lib/python2.5/config/libpython2.5.a: could not read symbols: Bad value collect2: ld returned 1 exit status make: *** [libplpython.so.0.0] Error 1 This runs on OpenSuse 10.3. python 2.5 postgres 8.2.5 ( and 8.3.0) Any clues? Thanks! Gerardo -- http://mail.python.org/mailman/listinfo/python-list
Re: Cant run application as ./myapp.py
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Robert, I have to guesses: a) The user as which you are trying to run the script is missing the execute right - fix by chmod u+x MyApplication.px b) You did not specify the interpreter - the first line of your script should look something like #!/usr/bin/python If none of this is the problem please post the error message you (hopefully) get. hth Nils Robert Rawlins schrieb: Hello Guys, I’ve got an application here which for some reason won’t start using the following syntax from the command line: Cd /mydirectory ./MyApplication.py I have to run this as a fully qualified python launch such as: Cd /mydirectory python MyApplication.py This is a little bit confusing to me as I have other applications which run just fine using the ./somthing.py syntax. Is there any reason why this doesn’t work? Cheers, Robert -BEGIN PGP SIGNATURE- iD8DBQFHzALBzvGJy8WEGTcRAtE8AJ4jGFTjZ8G8ayZM2AUcLcArnF5d1QCdH0gj kCdp0414HwPaIMIDv/SSTZA= =tF3K -END PGP SIGNATURE- begin:vcard fn;quoted-printable:Nils Oliver Kr=C3=B6ger n;quoted-printable:Kr=C3=B6ger;Nils Oliver email;internet:[EMAIL PROTECTED] version:2.1 end:vcard -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to return a variable and use it...?
Nathan Pinno wrote: Is it possible to return a variable and then use it I think you are asking about the ``global`` statement. URL:http://docs.python.org/ref/global.html like the following: Presumably not. ;-) Cheers, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
Re: Cant run application as ./myapp.py
En Mon, 03 Mar 2008 10:35:30 -0200, Robert Rawlins [EMAIL PROTECTED] escribió: I've got an application here which for some reason won't start using the following syntax from the command line: Cd /mydirectory ./MyApplication.py I have to run this as a fully qualified python launch such as: Cd /mydirectory python MyApplication.py This is a little bit confusing to me as I have other applications which run just fine using the ./somthing.py syntax. Is there any reason why this doesn't work? See this thread from last year: http://groups.google.com/group/comp.lang.python/browse_thread/thread/b1d0fd05b3615057/ -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Delete hidden files on unix
On Mar 3, 6:13 pm, Philipp Pagel [EMAIL PROTECTED]
wrote:
loial [EMAIL PROTECTED] wrote:
How can I delete hidden files on unix with python, i.e I want to do
equivalent of
rm .lock*
Here is one way to do it:
import os, glob
for filename in glob.glob('.lock*'):
os.unlink(filename)
Alternatively, you could also do this:
import os
os.system('rm .lock*')
cu
Philipp
--
Dr. Philipp Pagel
Lehrstuhl f. Genomorientierte Bioinformatik
Technische Universität Münchenhttp://mips.gsf.de/staff/pagel
Another way is to execute the linux command directly :)
Check here:
http://love-python.blogspot.com/2008/02/execute-linux-commands-in-python.html
regards,
subeen.
http://love-python.blogspot.com
--
http://mail.python.org/mailman/listinfo/python-list
Re: is there enough information?
On Mar 3, 7:11 am, Jean-Paul Calderone [EMAIL PROTECTED] wrote: On Tue, 26 Feb 2008 21:45:24 -0800, Dennis Lee Bieber [EMAIL PROTECTED] wrote: [snip] Threads, in Python, are good for parallel processing of items that tend to be I/O bound -- that is, stuff that blocks on lots of I/O calls allowing other threads to execute until they block too. Due to the GIL in the common Python implementation, threading is not useful for number-crunching (CPU bound) processing. Now, there is a very vocal group that recommend Twisted style asynchronous call-backs for everything in the world... But I think that group tends to forget that Windows I/O is incompatible with the low-level select() call often used to do parallel I/O -- leaving it only useful for the network socket I/O, but not local file I/O processing. I'm not sure, but you seem to be implying that the only way to use Windows' asynchronous I/O APIs is with threads. Actually, it is possible (and Twisted allows you) to use these as well without writing a threaded application. Perhaps you think it would be better to use them with threads, but that's certainly not the _only_ way to use them as you implied. Jean-Paul What's the API call for it? -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with the strip string method
Thanks to all respondents, Steve Holden
is right, I expected more than I should
have.
Others have explained why all your examples work as they should.
From your exmaples, it seems like you would like strip to
remove the leading and trailing characters from EVERY LINE in
your string. This can be done by the simple construct
my_string = ' foo\n bar '
'\n'.join(line.strip() for line in my_string.split('\n'))
'foo\nbar'
If you need this construct at several places, define a function
def line_strip(string,sep='\n') :
return sep.join(line.strip() for line in string.split(sep))
cheers,
- harold -
--
http://mail.python.org/mailman/listinfo/python-list
Exception or not
Suppose you have some HTML forms which you would like to validate. Every field can have different errors. For example, this are the forms: username password etc And you want to validate them with some class. Is this good pattern: class Foo(object): def validateUsername(username): if username isn't correct: raise ValidationError() def validatePassword(password): if password isn't correct: raise ValidationError() code: try: usernameError = validateUsername() except ValidationError: usernameError = error from exception try: passwordError = validatePassword() except ValidationError: passwordError = error from exception So, if there wasn't any errors, usernameError and passwordError both contains None, and there was error, both contains some string? Should I use exception or just return None or some string without exception? -- http://mail.python.org/mailman/listinfo/python-list
Re: Book Recomendations
The Python Forum has a good set of selections in their General Forum section: http://python-forum.org/pythonforum/viewtopic.php?f=1t=12st=0sk=tsd=asid=9b04b79b60f9afb56e4237856910d354start=20 -- http://mail.python.org/mailman/listinfo/python-list
Talking to a usb device (serial terminal)
Hey everyone, We have a usb spectrometer device that we have finally got working in linux (we were provided linux only drivers). The device has a Silicon Instruments cp2101 serial-to-usb chip onboard, and we loaded the kernel module cp2101.c after taking the device apart to see what was on the inside. Using minicom we are able to set a baud rate and open up a terminal when pointing to the device /dev/ttyusb0 (I think). Anyway, I want to be able to talk to our cool device using python. I haven't been able to find many resources specifically in this area, but there are a few package that are vaguely mentioned, including fcntl and termios. But the web doesn't seem to have a lot of documentation on fcntl, particularly information thats from the past 8 years. So my question is this - what is the easiest way to interface to this serial device? I don't imagine a straight read() and write() command to /dev/ttyusb0 is the most efficient (if it even works) especially since we would need to set a baud rate. My experience with terminal communication is pretty limited. Any advice that can be offered would be awesome. Thanks! PS: The device that we will be using python on will be an embedded ARM system. Currently we are testing using a linux laptop and cross compiling the kernel over to the embedded device. The device has Python 2.4, and does have both the termios and fcntl packages available. Python 2.4.2 (#1, Feb 20 2008, 11:07:36) [GCC 4.1.1] on linux2 uname -a: Linux gumstix 2.6.21gum #1 Wed Feb 20 02:53:01 EST 2008 armv5tel unknown Blaine Booher University of Cincinnati -- http://mail.python.org/mailman/listinfo/python-list
Re: Book Recomendations
On Mar 2, 6:16 am, David Cook [EMAIL PROTECTED] wrote: On 2008-03-02, Jeff Schwab [EMAIL PROTECTED] wrote: Python In A Nutshell: http://www.oreilly.com/catalog/pythonian2/ Another vote for the Nutshell book, which I find a very useful and practical book. I never found the Dive in book useful. Dave Cook Here's another vote for Python in a Nutshell. If you have a lot of experience with other languages, it should be all you need to get up to speed with python quickly. -- http://mail.python.org/mailman/listinfo/python-list
Re: Talking to a usb device (serial terminal)
So my question is this - what is the easiest way to interface to this serial device? http://pyserial.sourceforge.net/ or perhaps http://pyusb.berlios.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception or not
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hello, I don't think it is a good pattern because you are kind of mixing exceptions with return codes which makes the code a lot less readable later on. I personally would strongly opt for return codes in this case as one would intuitively expect a function named validateThisAndThat to return the result of a validation. This might me a simple true/false, a numeric code with 0=OK, 1=password not correct, 2=user does not exist or a string, whatever you need. In my opinion, such a function should raise an exception if it is unable to fullfill its task. For example lost connection to user database or things like that. A function should never propagate an expected result as an exception. Greetings Nils Monica Leko schrieb: | Suppose you have some HTML forms which you would like to validate. | Every field can have different errors. For example, this are the | forms: | | username | password | etc | | And you want to validate them with some class. Is this good pattern: | | class Foo(object): | def validateUsername(username): | if username isn't correct: | raise ValidationError() | def validatePassword(password): | if password isn't correct: | raise ValidationError() | | code: | try: | usernameError = validateUsername() | except ValidationError: | usernameError = error from exception | try: | passwordError = validatePassword() | except ValidationError: | passwordError = error from exception | | So, if there wasn't any errors, usernameError and passwordError both | contains None, and there was error, both contains some string? Should | I use exception or just return None or some string without | exception? -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzCGhzvGJy8WEGTcRAvbGAJoDjn39xCmiOLmkc//0RTfeVXJFTACePRIG uYoDiQBZwRsShUn60LN/9oQ= =zvAY -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: Import, how to change sys.path on Windows, and module naming?
On 1 Mar, 20:17, Steve Holden [EMAIL PROTECTED] wrote: Jeremy Nicoll - news posts wrote: Jeremy Nicoll - news posts [EMAIL PROTECTED] wrote: If I understand correctly, when I import something under Windows, Python searches the directory that the executing script was loaded from, then other directories as specified in sys.path. Sorry to followup my own question, but I ran for p,q in enumerate(sys.path): print p, q and got: 0 C:\Documents and Settings\Laptop\My Documents\JN_PythonPgms 1 C:\Program Files\~P-folder\Python25\Lib\idlelib 2 C:\WINDOWS\system32\python25.zip 3 C:\Program Files\~P-folder\Python25\DLLs 4 C:\Program Files\~P-folder\Python25\lib 5 C:\Program Files\~P-folder\Python25\lib\plat-win 6 C:\Program Files\~P-folder\Python25\lib\lib-tk 7 C:\Program Files\~P-folder\Python25 8 C:\Program Files\~P-folder\Python25\lib\site-packages 9 C:\Program Files\~P-folder\Python25\lib\site-packages\win32 10 C:\Program Files\~P-folder\Python25\lib\site-packages\win32\lib 11 C:\Program Files\~P-folder\Python25\lib\site-packages\Pythonwin Does every Windows user have: 2 C:\WINDOWS\system32\python25.zip in their sys.path? What's the point of having a zip in the path? So that the files inside the zip can be imported as modules and packsges, of course. Also, looking in C:\WINDOWS\system32\ I don't actually have a file called python25.zip, but I do have one called python25.dll - so has something gone wrong in creation of sys.path? No. I'm not sure why the zip file is on there by default. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/- Nascondi testo tra virgolette - - Mostra testo tra virgolette - I believe the answer is in how the new import protocol (PEP 302) works: when you install a new path handler in sys.import_hooks, this is called for each element of sys.path; the path handler has two options: either to raise ImportError, which means that cannot handle the specific path, or to return an object with the methods defined in the PEP, which means that the returned object - and only that one - will be used to import modules in the specific path. This means that only one path handler can be used for each element of sys.path. Therefore, if you want to add a path handler that does not interfere with the other ones, one way to do it is to add something in sys.path that is rejected by all path handlers except yours. I believe that python25.zip is that 'something' that is used by the zipimporter path handler, which allows to import directly from zip files. I did something similar in my toy experiment with the import hooks, half-believing that there was something I missed. Nice to see that the 'big guys' did the same trick :-) (unless of course I _did_ miss something and my guess is completely wrong; I should have done some experiment before posting, but I'm too lazy for that). Ciao --- FB -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception or not
Monica Leko wrote: Suppose you have some HTML forms which you would like to validate. Every field can have different errors. For example, this are the forms: username password etc And you want to validate them with some class. Is this good pattern: [...] You could have a look at how django [http://www.djangoproject.com] and how they handle forms: http://www.djangoproject.com/documentation/newforms/ In fact their newforms module should work fine as a standalone. -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: [SQL] compiling plpython compilation error
Gerardo Herzig [EMAIL PROTECTED] writes: Hi all. Im having a hard time trying to compile the plpython package. This is the error make gives me: /usr/lib/python2.5/config/libpython2.5.a(abstract.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC Well, I'd try following the error message's advice: use -fPIC not -fpic. Note that it's not real clear whether this needs to be done for plpython, or libpython, or perhaps both; so you might well be in for making a custom libpython installation. regards, tom lane -- http://mail.python.org/mailman/listinfo/python-list
Re: Exception or not
Monica Leko a écrit : Suppose you have some HTML forms which you would like to validate. Every field can have different errors. For example, this are the forms: username password etc And you want to validate them with some class. This is what the FormEncode package is for. -- http://mail.python.org/mailman/listinfo/python-list
Re: Import, how to change sys.path on Windows, and module naming?
On 3 Mar, 17:12, [EMAIL PROTECTED] wrote: (unless of course I _did_ miss something and my guess is completely wrong; I should have done some experiment before posting, but I'm too lazy for that). Ciao --- FB- Nascondi testo tra virgolette - - Mostra testo tra virgolette - Oops... I tried removing python25.zip from sys.path, and I can still import packages from zip files ... so my guess was wrong and my lazyness has been punished :-) Ciao - FB -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
Jeff Schwab [EMAIL PROTECTED] writes: User defined types in python are fairly heavyweight compared with the built-in types, Yet they continue to form the basis of almost all non-trivial Python programs. Anyway, it's a bit soon to be optimizing. :) Large python programs usually have some classes for complex data structures, but it's not typical Pythonic practice to define new classes for things as small as integers. and a type like that is just another thing for the user to have to remember. How so? A well-written function generally shouldn't depending on the exact types of its arguments, anyway. By another thing to remember I mean doing the right thing should happen with the normal integers that result from writing literals like 1 and 2, without resorting to a nonstandard user defined type. If someone has written a function to find (e.g.) the median of a collection of numbers, their code should already be prepared to accept values of user-defined numeric types. It's important to be able to write such generic or polymorphic functions, but most typical functions are monomorphic. If I want to call such a function with my hand-rolled DivisionSafeInteger type, it should just work, Sure, however, the Pythonic approach is to make the defaults do the right thing without requiring such user-written workarounds. Of course there is occasional unclarity about what the right thing is. file) and size_t, so if you pass an off_t to a function that expects a size_t as that arg, the compiler notices the error. On what compiler? I've never seen a C compiler that would mind any kind of calculation involving two native, unsigned types. You are right, C is even worse than I remembered. But they are really just integers and they compile with no runtime overhead. They do indeed have run-time overhead, as opposed to (e.g.) meta-types whose operations are performed at compile-time. Not sure what you mean; by no runtime overhead I just mean they compile to the same code as regular ints, no runtime checks. OK, it turns out that for all intents and purposes it looks like they ARE regular ints even at compile time, but in other languages it's not like that. If you mean they have less overhead than types whose operations perform run-time checks, then yes, of course that's true. You specifically stated (then snipped) that you would be happier if int/int always threw an error. The beauty of a language with such extensive support for user-defined types that can be used like built-in type is that you are free to define types that meet your needs. But those are not ints then. We're discussing an issue of language design, which is what the behavior of the ordinary, standard, default ints should be. My reason for suggesting int/int-error is that I think it would increase program reliability in general. But that is only if it applies to all the ints by default, with int/int=float being a possible result of a nonstandard user-defined type. From the zen list: In the face of ambiguity, refuse the temptation to guess. My understanding is that Python will easily support lots of different types of just about anything. That's the point. No I don't think so. Also from the zen list: There should be one-- and preferably only one --obvious way to do it. There's an interesting talk linked from LTU about future languages: http://lambda-the-ultimate.org/node/1277 Thanks, but that just seems to have links to the slides. Is there a written article, or a video of Mr. Sweeney's talk? I don't think there's an article. There might be video somewhere. I thought the slides were enough to get the ideas across so I didn't have much interest in sitting through a video. -- http://mail.python.org/mailman/listinfo/python-list
SQLObject 0.9.4
Hello! I'm pleased to announce the 0.9.4 release of SQLObject. What is SQLObject = SQLObject is an object-relational mapper. Your database tables are described as classes, and rows are instances of those classes. SQLObject is meant to be easy to use and quick to get started with. SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite, and Firebird. It also has newly added support for Sybase, MSSQL and MaxDB (also known as SAPDB). Where is SQLObject == Site: http://sqlobject.org Development: http://sqlobject.org/devel/ Mailing list: https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss Archives: http://news.gmane.org/gmane.comp.python.sqlobject Download: http://cheeseshop.python.org/pypi/SQLObject/0.9.4 News and changes: http://sqlobject.org/News.html What's New == News since 0.9.3 Bug Fixes ~ * Use list.reverse() in manager/command.py for Python 2.2 compatibility. * Prevent MultipleJoin from removing the intermediate table if it was not created by the Join. * Fixed a bug with no default when defaultSQL is defined for the column. * Recognize POINT data type as string in PostgresConnection.columnsFromSchema(). For a more complete list, please see the news: http://sqlobject.org/News.html Oleg. -- Oleg Broytmannhttp://phd.pp.ru/[EMAIL PROTECTED] Programmers don't die, they just GOSUB without RETURN. -- http://mail.python.org/mailman/listinfo/python-list
urlsafe_b64decoding of xml node text
Hi All, I am running Apache with mod_python. A post message to my server contains an xml of the form a b(some base64 ur-safe-encoded data)/b /a I use minidom to parse the xml posted, and now try to decode the data using the following import minidom import base64 decData = base64.urlsafe_b64decode(data) #data is the above mentioned url-safe-encoded data This line fails with the following error Error : type 'exceptions.TypeError' Error : character mapping must return integer, None or unicode Error : traceback object at 0x1b38e40 If i run the same data through a script on the terminal, I am able to successfully decode the data. What could be the reason for this error? Can it be because of some encoding introduced by minidom? I think urlsafe_b64decode takes ascii string. Thanks, Kaushik -- http://mail.python.org/mailman/listinfo/python-list
Re: Decorators and buffer flushing
Hi, Gabriel. I missed this message initially; I apologize for not responding sooner. On Thu, 28 Feb 2008 18:53:28 -0500, Gabriel Genellina [EMAIL PROTECTED] wrote: I can reproduce the issue in the console. I'm not convinced it's actually a bug, unless for some reason the interpreter is preventing a buffer flush. Try starting the interpreter with python -u xxx.py (-u = unbuffered) but I don't really think this might be the cause. Are you sure the code actually says sys.stdout.flush() and not sys.stdout.flush? As I mentioned in another message, I haven't had any luck with adding '-u' to the invocation of the interpreter. I am sure I'm not looking at the callable object rather than calling flush(). sys.stdout.write (%s % (self.name.ljust(30),)) Usually written as: sys.stdout.write(%-30s % self.name) Thanks for the tips! [...] Is it possible that flushing is prohibited until __exit__ is called? I don't think so... What's your platform/OS? I'm running Ubuntu Feisty with Python 2.5.1: Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Try to post a minimal example showing the problem - copy paste it, don't retype. Maybe in the process of reducing your code to find the minimal example, you find the problem yourself. The minimal example is a little long, but I think in the end I figured out what was happening. The initial build step took the longest amount of time to complete, but the other steps were nearly instantaneous. So the post-build '.' would appear, and the very fast run of the other steps made it appear as though everything was being buffered when it wasn't. Adding in a short delay (time.sleep(0.05) seemed to work) helped demonstrate that the data actually were unbuffered. Are you aware of the existing framework for unit tests? the unittest module? Yes. I haven't investigated its uses in this context due to the constraints of the legacy system and general inertia. I'm trying to duplicate functionality while addressing certain annoyances with the previous system. Thanks again for your help! Best, Ethan -- Ethan Metsger http://uppertank.net/ethanm/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Talking to a usb device (serial terminal)
blaine wrote: So my question is this - what is the easiest way to interface to this serial device? I don't imagine a straight read() and write() command to /dev/ttyusb0 is the most efficient (if it even works) It doesn't only work, it's the preferred way (if you don't use advanced wrappers like pyserial). For the basics see http://www.easysw.com/~mike/serial/serial.html especially since we would need to set a baud rate. What is the relationship between read/write, the baud rate, and efficiency? The serial port is configured using POSIX terminal interface (termios). Regards, Björn -- BOFH excuse #89: Electromagnetic energy loss -- http://mail.python.org/mailman/listinfo/python-list
Inheritance issue...
I'm trying to use inheritance to create a simple binary tree, but it's not going so well... here's what I pull from the documentation for super() super( type[, object-or-type]) Return the superclass of type. If the second argument is omitted the super object returned is unbound. If the second argument is an object, isinstance(obj, type) must be true. If the second argument is a type, issubclass(type2, type) must be true. super() only works for new-style classes. A typical use for calling a cooperative superclass method is: class C(B): def meth(self, arg): super(C, self).meth(arg) So here's what I do: class Node: def __init__(self, val=0, prnt = None): self.value = val self.parent = prnt class Tree(Node): def __init__(self, val=0): self.root = super(Tree, self).__init__(val) self.leftChild = None self.rightChild = None def addChild(self, value): if self.root == None: self.__init__(value) else: n = self.root while(n is not None): if(n.leftChild == None and n.rightChild == None): n.leftChild = Node(value, n) elif(n.rightChild == None): n.rightChild = Node(value, n) else: if(n.leftChild.leftChild is not None and n.leftChild.rightChild is not None): n = n.rightChild else: n = n.leftChild def printTree(self): if self.root == None: print None else: n = self.root print n.value while(n is not None): if(n.leftChild is None): print str(n.value) + 's left child is None elif(n.rightChild is None): print str(n.value) + 's right child is None else: if(n.leftChild.leftChild is not None and n.leftChild.rightChild is not None): n = n.rightChild else: n = n.leftChild def main(): play = Tree(1) play.addChild(2) play.addChild(3) play.addChild(4) play.addChild(5) play.printTree() if __name__ == __main__: main() ...and here's what I get: Traceback (most recent call last): File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 53, in module main() File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 45, in main play = Tree(1) File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 8, in __init__ self.root = super(Tree, self).__init__(val) TypeError: super() argument 1 must be type, not classobj Looks to me like the super(Tree, self)__init__(val) follows the example in the documentation, but I may be a witch. Anyone know why this doesn't work? -- http://mail.python.org/mailman/listinfo/python-list
clocking subprocesses
Hi, I've seen several threads on this subject, but haven't (yet) run across one that answers my specific questions. This should be really easy for someone, so here goes: I'm running some numerical simulations under Ubuntu, and using Python as my scripting language to automatically manage input and output. I need to have a precise performance measurement (CPU time) of how long it takes to run my simulations. Right now I have something like: stime = time.time() subprocess.call([./mysim,args]) ftime = time.time() print ftime-stime However, time.time() only gives wall-clock time, so I'm also measuring the time it takes to run other processes running at the same time. What I'd rather have is: stime = time.clock() subprocess.call([./mysim,args]) ftime = time.clock() print ftime-stime But this, of course, usually outputs 0, because time.clock() does not count the CPU ticks of the subprocess. So, long story short, I need to get CPU time of something I call using subprocess.call(). I don't want to have to profile my code, since it will significantly reduce computation time. Thanks for the advice. Kevin -- http://mail.python.org/mailman/listinfo/python-list
News from Jython world
Frank Wierzbicki and Ted Leung have been hired by Sun. Frank is a key Jython developer and is specifically hired to work full time on Jython, a version of the Python interpreter that runs on top of the JVM and provides full access to Java libraries. After a period where the development had slowed, Jython was recently getting seriously back on track. Now it's getting even better ! Don't wait too much ... Jython is very useful RIGHT NOW if you live in the Java Universe. More details at: - http://www.infoworld.com/article/08/03/03/hirings-python_1.html - http://fwierzbicki.blogspot.com/2008/02/jythons-future-looking-sunny.html Cheers, SB -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance issue...
On Mar 3, 9:37 am, MooMaster [EMAIL PROTECTED] wrote: I'm trying to use inheritance to create a simple binary tree, but it's not going so well... here's what I pull from the documentation for super() super( type[, object-or-type]) Return the superclass of type. If the second argument is omitted the super object returned is unbound. If the second argument is an object, isinstance(obj, type) must be true. If the second argument is a type, issubclass(type2, type) must be true. super() only works for new-style classes. A typical use for calling a cooperative superclass method is: class C(B): def meth(self, arg): super(C, self).meth(arg) So here's what I do: class Node: def __init__(self, val=0, prnt = None): self.value = val self.parent = prnt class Tree(Node): def __init__(self, val=0): self.root = super(Tree, self).__init__(val) self.leftChild = None self.rightChild = None def addChild(self, value): if self.root == None: self.__init__(value) else: n = self.root while(n is not None): if(n.leftChild == None and n.rightChild == None): n.leftChild = Node(value, n) elif(n.rightChild == None): n.rightChild = Node(value, n) else: if(n.leftChild.leftChild is not None and n.leftChild.rightChild is not None): n = n.rightChild else: n = n.leftChild def printTree(self): if self.root == None: print None else: n = self.root print n.value while(n is not None): if(n.leftChild is None): print str(n.value) + 's left child is None elif(n.rightChild is None): print str(n.value) + 's right child is None else: if(n.leftChild.leftChild is not None and n.leftChild.rightChild is not None): n = n.rightChild else: n = n.leftChild def main(): play = Tree(1) play.addChild(2) play.addChild(3) play.addChild(4) play.addChild(5) play.printTree() if __name__ == __main__: main() ...and here's what I get: Traceback (most recent call last): File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 53, in module main() File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 45, in main play = Tree(1) File C:/Users/The_N_Channel/Desktop/funWithTrees.py, line 8, in __init__ self.root = super(Tree, self).__init__(val) TypeError: super() argument 1 must be type, not classobj Looks to me like the super(Tree, self)__init__(val) follows the example in the documentation, but I may be a witch. Anyone know why this doesn't work? Node should inherit from `object'. Unless you inherit from object you are using old-style classes, which do not derive from type and cannot use the super method. Example: class Node(object): Also, __init__ does not return anything, ever. This doesn't make sense: self.root = super(Tree, self).__init__(val) When you call the __init__ method of a base class, it will operate on self. Example: class CBase(object): ... def __init__(self, a): ... self.a = a ... class C(CBase): ... def __init__(self, a, b): ... super(C, self).__init__(a) ... self.b = b ... c = C(1,2) c.a 1 c.b 2 Doing things like self.__init__(val) doesn't make sense. Matt -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance issue...
MooMaster schrieb: I'm trying to use inheritance to create a simple binary tree, but it's not going so well... here's what I pull from the documentation for super() super( type[, object-or-type]) Return the superclass of type. If the second argument is omitted the super object returned is unbound. If the second argument is an object, isinstance(obj, type) must be true. If the second argument is a type, issubclass(type2, type) must be true. super() only works for new-style classes. The last sentence contains the important bit. You need to use new-style-classes, which means they have to have the ancestor object somewhere in their inheritance-graph. Like this: class Foo(object): pass Certainly one of the somewhat uglier corners of Python... Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Delete hidden files on unix
On Mar 3, 9:38 am, subeen [EMAIL PROTECTED] wrote:
On Mar 3, 6:13 pm, Philipp Pagel [EMAIL PROTECTED]
wrote:
loial [EMAIL PROTECTED] wrote:
How can I delete hidden files on unix with python, i.e I want to do
equivalent of
rm .lock*
Here is one way to do it:
import os, glob
for filename in glob.glob('.lock*'):
os.unlink(filename)
Alternatively, you could also do this:
import os
os.system('rm .lock*')
cu
Philipp
--
Dr. Philipp Pagel
Lehrstuhl f. Genomorientierte Bioinformatik
Technische Universität Münchenhttp://mips.gsf.de/staff/pagel
Another way is to execute the linux command directly :)
Check
here:http://love-python.blogspot.com/2008/02/execute-linux-commands-in-pyt...
Note that that can get dangerous with shell expansions:
e.g. (don't run in a directory with files you want to keep!)
import os
open(--help, w)
os.system(rm *help)
will actually run rm --help, printing the help for rm rather than
removing the file named --help. There are a lot of security
implications to allowing this kind of shell expansion of commands.
The system-call method with os.unlink is easier to get right.
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Re: clocking subprocesses
On Mar 3, 11:57 am, [EMAIL PROTECTED] wrote: So, long story short, I need to get CPU time of something I call using subprocess.call(). Run your command through the time program. You can parse the output format of time, or set a custom output format. This mostly applies to Unix-like systems but there is probably an equivalent somewhere on Windows. Preston -- http://mail.python.org/mailman/listinfo/python-list
Re: Beautiful Code in Python?
On Mar 2, 8:35 am, Michele Simionato [EMAIL PROTECTED] wrote: On Mar 2, 5:23 pm, js [EMAIL PROTECTED] wrote: Hi, Have you ever seen Beautiful Python code? Zope? Django? Python standard lib? or else? Please tell me what code you think it's stunning. The doctest module in the standard library. M.S. The first thing of beauty I found in Python (coming from C, C++, and perl) was the way Python handled variables, or as someone recently described them, names. Python's for statement is always beautiful to look at. Especially when someone uses the else clause rather than trying to detect if the list was exhausted. I sometimes avoid using the comprehensions just to get an excuse to write another for loop in Python. There can never be enough for loops written in Python! Also, Python's iterator interface is by far the most beautiful thing I have ever seen in the world of programming. Of course, the reason why the for loop is so beautiful is because iterators are so beautiful. -- http://mail.python.org/mailman/listinfo/python-list
Polymorphism using constructors
I'm writing a class for rational numbers and besides the most obvious constructor def __init__ (self, nomin, denom): i also wish to have two supporting ones def __init__ (self, integ): self.__init__ (integ, 1) def __init__ (self): self.__init__ (0, 1) but for some reason (not known to me at this point) i get errors. My suspicion is that it's a syntax issue. Suggestions? -- Regards Konrad Viltersten sleep- a substitute for coffee for the poor ambition - lack of sense to be lazy -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Mar 3, 4:39 pm, Paul Rubin http://[EMAIL PROTECTED] wrote: [...] You are right, C is even worse than I remembered. It's good enough to be the language used for the reference implementation of python :-) [...] -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Polymorphism using constructors
K Viltersten schrieb: I'm writing a class for rational numbers and besides the most obvious constructor def __init__ (self, nomin, denom): i also wish to have two supporting ones def __init__ (self, integ): self.__init__ (integ, 1) def __init__ (self): self.__init__ (0, 1) but for some reason (not known to me at this point) i get errors. My suspicion is that it's a syntax issue. Suggestions? errors is not much of an error-description. That's what stacktraces are for. Apart from that, you won't succeed with the above. Python has no signature-based polymorphism. Instead, you use default arguments, like this: def __init__(nomin=0, denom=1): ... That should suffice. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance issue...
On Mar 3, 11:49 am, Diez B. Roggisch [EMAIL PROTECTED] wrote: MooMaster schrieb: I'm trying to use inheritance to create a simple binary tree, but it's not going so well... here's what I pull from the documentation for super() super( type[, object-or-type]) Return the superclass of type. If the second argument is omitted the super object returned is unbound. If the second argument is an object, isinstance(obj, type) must be true. If the second argument is a type, issubclass(type2, type) must be true. super() only works for new-style classes. The last sentence contains the important bit. You need to use new-style-classes, which means they have to have the ancestor object somewhere in their inheritance-graph. Like this: class Foo(object): pass Certainly one of the somewhat uglier corners of Python... Diez Thanks guys, I hadn't even heard of the distinction between old and new style classes...is this in the tutorial somewhere? I didn't see it in Classes... -- http://mail.python.org/mailman/listinfo/python-list
Re: clocking subprocesses
On Mar 3, 12:41 pm, Preston Landers [EMAIL PROTECTED] wrote: Run your command through the time program. You can parse the output format of time, or set a custom output format. This mostly applies to Unix-like systems but there is probably an equivalent somewhere on Windows. Preston Thanks for the quick answer. That seems to work, though, I'll write a timesubprocess() function which runs the program through time and spits the formatted out to a file, then parses that file, then returns the execution time. There doesn't appear to be a more elegant way to do this. Kevin -- http://mail.python.org/mailman/listinfo/python-list
FW: unable to download PyGEP
__ From: Blubaugh, David A. Sent: Monday, March 03, 2008 3:39 PM To: '[EMAIL PROTECTED]' Subject: unable to download PyGEP Dear Sir, I have been having issues installing PyGEP. I have tried the following: at MS-DOS command prompt cd C:\python25\PyGEP-0.3.0.dev-r117 I then enter setup.py on command prompt. It then states that it could not find a module named setuptools in order to install. Can you help me with this issue ?? Thanks David Blubaugh This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. -- http://mail.python.org/mailman/listinfo/python-list
sympy: what's wrong with this picture?
Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it fucks up other modules. -- http://mail.python.org/mailman/listinfo/python-list
Re: Beautiful Code in Python?
Please tell me what code you think it's stunning. Pexpect is (almost) pseudocode is (almost) poetry to my ears. And there's a lot of narrative in it as well: http://pexpect.svn.sourceforge.net/viewvc/*checkout*/pexpect/trunk/pexpect/pexpect.py?content-type=text%2Fplain -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 3:40 pm, Mensanator [EMAIL PROTECTED] wrote: Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it f***s up other modules. Dude, relax. It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. Or better yet, submit a patch. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: Talking to a usb device (serial terminal)
On Mar 3, 12:31 pm, Bjoern Schliessmann usenet- [EMAIL PROTECTED] wrote: It doesn't only work, it's the preferred way (if you don't use advanced wrappers like pyserial). For the basics see http://www.easysw.com/~mike/serial/serial.html [...] What is the relationship between read/write, the baud rate, and efficiency? The serial port is configured using POSIX terminal interface (termios). Thank you so much for that reference link, it was very helpful. I now understand the difference in the modules - termios and fctnl. As far as PySerial goes - were trying to stick to built-in modules since cross compiling to an arm processor is being a little bit of a pain for us. Thank you for the suggestion though! Thanks! Blaine -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance issue...
On Mar 3, 3:14 pm, MooMaster [EMAIL PROTECTED] wrote: On Mar 3, 11:49 am, Diez B. Roggisch [EMAIL PROTECTED] wrote: MooMaster schrieb: I'm trying to use inheritance to create a simple binary tree, but it's not going so well... here's what I pull from the documentation for super() super( type[, object-or-type]) Return the superclass of type. If the second argument is omitted the super object returned is unbound. If the second argument is an object, isinstance(obj, type) must be true. If the second argument is a type, issubclass(type2, type) must be true. super() only works for new-style classes. The last sentence contains the important bit. You need to use new-style-classes, which means they have to have the ancestor object somewhere in their inheritance-graph. Like this: class Foo(object): pass Certainly one of the somewhat uglier corners of Python... Diez Thanks guys, I hadn't even heard of the distinction between old and new style classes...is this in the tutorial somewhere? I didn't see it in Classes... Here's some reading material (it can get deep): http://www.python.org/doc/newstyle/ http://www.python.org/download/releases/2.2.3/descrintro/ New style classes have been a part of Python since 2.2, but unfortunately many documents intended for newbies don't even mention them, which seems to cause more confusion than it prevents, such as when newbies go Googling for code examples and see incompatible usage of new-style classes. For simple uses, new-style and old-style classes behave similarly enough that it doesn't matter which you use, but new-style classes support lots of things that old-style classes don't, and usage of these features is getting more and more common. Newbies who aren't being alerted to this are getting a raw deal. Thankfully old-style classes are getting the axe in Python 3.0 and hopefully this confusion will go away. Until you switch to 3.0, inherit your base classes from object; it will ensure that more recent additions like properties and super() calls work. class Node(object): Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: Polymorphism using constructors
On Mar 3, 12:21 pm, K Viltersten [EMAIL PROTECTED] wrote:
I'm writing a class for rational numbers
and besides the most obvious constructor
def __init__ (self, nomin, denom):
i also wish to have two supporting ones
def __init__ (self, integ):
self.__init__ (integ, 1)
def __init__ (self):
self.__init__ (0, 1)
For this particular use case, providing default arguments will
suffice:
class Fraction:
def __init__(self, numerator=0, denomiator=1):
...
Since Python doesn't support having two methods with the same name,
the usual solution is to provide alternative constructors using
classmethod():
@classmethod
def from_decimal(cls, d)
sign, digits, exp = d.as_tuple()
digits = int(''.join(map(str, digits)))
if sign:
digits = -digits
if exp = 0:
return cls(digits * 10 ** exp)
return cls(digits, 10 ** -exp)
Raymond
--
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Re: Talking to a usb device (serial terminal)
On 2008-03-03, blaine [EMAIL PROTECTED] wrote: As far as PySerial goes - were trying to stick to built-in modules since cross compiling to an arm processor is being a little bit of a pain for us. pyserial is pure python, so I don't see how it's going to be any more painful than something you write yourself. If you want something that's more of a transparent object wrapper aroudn the Posix serial interface, there's PosixSerial.py (upon which pyserial's posix support is based): ftp://ftp.visi.com/users/grante/python/PosixSerial.py -- Grant Edwards grante Yow! Everybody gets free at BORSCHT! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Mar 2, 11:36 pm, Paul Rubin http://[EMAIL PROTECTED] wrote:
Lie [EMAIL PROTECTED] writes:
You hit the right note, but what I meant is the numeric type
unification would make it _appear_ to consist of a single numeric type
(yeah, I know it isn't actually, but what appears from outside isn't
always what's inside).
That is clearly not intended; floats and decimals and integers are
really different from each other and Python has to treat them distinctly.
In certain operations it would, such as:
a = Decimal('32.324')
b = 90.3453
c = 43
d = a + b + cthis should work without manual type casting
This behavior is what is intended in numeric type unification, floats
and decimals and integers should work together flawlessly without the
need for manual type casting. This gives the _impression_ of a single
numeric type (although programmers should still be aware that the
underlying type still exists). It's true Python have to treat them
differently, but programmers would be able to treat them all the same
(at least in most parts)
Try with a=7, b=25
They should still compare true, but they don't. The reason why they
don't is because of float's finite precision, which is not exactly
what we're talking here since it doesn't change the fact that
multiplication and division are inverse of each other.
What? Obviously they are not exact inverses for floats, as that test
shows. They would be inverses for mathematical reals or rationals,
but Python does not have those.
When I said multiplication and division are inverse, I was pointing
out the fact that even though float's inexactness make them imperfect
inverse, mult div are still inverse of each other. In-practice, the
inversing behavior is impossible unless we have a way to represent
real number (which we don't), and the *workaround* to make them work
is to do epsilon comparison.
When I'm talking about things I usually talk in purely theoretical
condition first and considers practical implementations that doesn't
work that way as making up a workaround inside their limitations. In
this case, the theoretical condition is that multiplication and
division is inverse of each other. The practical consideration is
float is inexact and reals is impossible, and thus epsilon comparison
is necessary to walk around float's limitations so multiplication and
division could still be inverses.
Aside: Python would have rationals
One way to handle this situation is to do an epsilon aware
comparison (as should be done with any comparison involving floats),
but I don't do it cause my intention is to clarify the real problem
that multiplication is indeed inverse of division and I want to
avoid obscuring that with the epsilon comparison.
I think you are a bit confused. That epsilon aware comparison thing
acknowledges that floats only approximate the behavior of mathematical
reals.
Yes, I realized that floats aren't the same as reals.
When we do float arithmetic, we accept that equal often
really only means approximately equal. But when we do integer
arithmetic, we do not expect or accept equality as being approximate.
Integer equality means equal, not approximately equal. That is why
int and float arithmetic cannot work the same way.
No, no, they don't work the same way, but they should appear to work
the same way as reals in pure mathematics do. Again, I'm talking in
theory first: ints and floats should work the same way, but since
practical considerations make them impossible, then they should at
least appear to work the same way (or they would have become
completely different things, remember duck typing?).
--
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Re: Talking to a usb device (serial terminal)
pyserial is pure python, so I don't see how it's going to be any more painful than something you write yourself. If you want something that's more of a transparent object wrapper aroudn the Posix serial interface, there's PosixSerial.py (upon which pyserial's posix support is based): ftp://ftp.visi.com/users/grante/python/PosixSerial.py -- Grant Edwards grante Yow! Everybody gets free at BORSCHT! visi.com Oh - good point. There wouldn't be any compilation issues with the C api. Nevermind! :) I do have a question though. In the termios module, I am attempting to set the baud rate to 921600, which is what we use with 'cutecom' (because minicom does not have this as an option) and is what the supplier recommends. When I try to set the rate using termios.tcsetattr(), I get an Argument Error. I do not get this when I use an existing baud rate, such as termios.B9600. Is there a way I can get around this? We would like to use it at full speed. Thank you, Blaine -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 3:40 pm, Mensanator [EMAIL PROTECTED] wrote: Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it f***s up other modules. Dude, relax. It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. I posted it here because someone recommended it. I'm simply un-recommending it. Those who don't care needn't pay any attention. Those who do should be glad that faults are pointed out when found. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: Polymorphism using constructors
On Mar 3, 4:17 pm, Raymond Hettinger [EMAIL PROTECTED] wrote:
Since Python doesn't support having two methods with the same name,
the usual solution is to provide alternative constructors using
classmethod():
@classmethod
def from_decimal(cls, d)
sign, digits, exp = d.as_tuple()
digits = int(''.join(map(str, digits)))
if sign:
digits = -digits
if exp = 0:
return cls(digits * 10 ** exp)
return cls(digits, 10 ** -exp)
Note that even some of Python's built in types (dict *cough*)
implement homemade function overloading.
The OP wanted to write a constructor that could accept either a pair
of integers or a rational, there would be a good precedent for it.
However, I would advise the OP to use the constructor only for the
most common arguments, and use classmethods for more obscure, less
common arguments (such as decimal or even float).
Carl Banks
--
http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
Mensanator wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. Did you even try to figure it out? It took me all of 5 minutes to find the mistake. I posted it here because someone recommended it. I'm simply un-recommending it. It was a mistake, an easily remedied mistake, not a big unchangeable design decision. If you want to recommend against sympy as a package, there is a larger burden of proof that you have yet to meet. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Talking to a usb device (serial terminal)
On 2008-03-03, blaine [EMAIL PROTECTED] wrote: I do have a question though. In the termios module, I am attempting to set the baud rate to 921600, which is what we use with 'cutecom' (because minicom does not have this as an option) and is what the supplier recommends. When I try to set the rate using termios.tcsetattr(), I get an Argument Error. What values are you using for ispeed and ospeed? Those values are special (and rather arbitrary) constant bit-patterns and not simply integers like 9600 or 115200. I do not get this when I use an existing baud rate, such as termios.B9600. Is there a way I can get around this? We would like to use it at full speed. It looks like the fastest speed supported by python termios on Linux is B460800 (uses a constant of 0x1004). If you look in /usr/include/..., baud rates do go up to 921600 (which uses a constant of 0x1007). Try using the appropriate constant from /usr/include/... (for the target platform, of course). -- Grant Edwards grante Yow! Please come home with at me ... I have Tylenol!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Beautiful Code in Python?
On Mar 2, 1:18 pm, [EMAIL PROTECTED] wrote: On Mar 2, 12:01 pm, John DeRosa [EMAIL PROTECTED] wrote: On Mon, 3 Mar 2008 01:23:32 +0900, js [EMAIL PROTECTED] wrote: Hi, Have you ever seen Beautiful Python code? Zope? Django? Python standard lib? or else? Please tell me what code you think it's stunning. Just about any Python code I look at. Decorators, with, and namedtuple. IMO, decorators are functional but far from beautiful. They're a special, somewhat ugly syntax for something that was already handled by normal constructs (foo=classmethod(foo)) that you didn't need extra knowledge to understand. On balance I think it's worth it in order to get those declarations up by the function defs, but it's sort of a tradeoff of magical non- explicitness for pragmatism over purity. A worthwile tradeoff, but not what I'd ever call beautiful. -- http://mail.python.org/mailman/listinfo/python-list
Re: First post from a Python newbiw
Arnaud Delobelle schrieb: It's a FAQ: http://www.python.org/doc/faq/programming/#how-do-i-create-a-multidimensional-list Somewhere on my todo list I have read through the whole Python FAQ, but so far never got round doing it. Should probably set it to prio A. -- Christoph -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] [ANN] Python 2.3.7 and 2.4.5, release candidate 1
Can you also add a note to the 2.3 and 2.4 web pages? You mean the 2.3.7 and 2.4.5 web pages? Sure. (If you mean some other web pages, please give precise URLs). Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 4:47 pm, Mensanator [EMAIL PROTECTED] wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 3:40 pm, Mensanator [EMAIL PROTECTED] wrote: Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it f***s up other modules. Dude, relax. It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. I posted it here because someone recommended it. I'm simply un-recommending it. Those who don't care needn't pay any attention. Those who do should be glad that faults are pointed out when found. 1. You can point out the faults of a program without insults and vulgarity 2. You must be terribly difficult to please if one bug is enough to recommend against a program as worse than worthless 3. You must be terribly naive if you expect a freeware program with a version number of 0.5.12 not to have bugs Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
I swear, this is one of the most polite-oriented groups I've ever seen. Not that that's a bad thing or anything, it's nice to be nice. (This has been Captain Universal Truth, over and out) -- http://mail.python.org/mailman/listinfo/python-list
Re: clocking subprocesses
[EMAIL PROTECTED] wrote: On Mar 3, 12:41 pm, Preston Landers [EMAIL PROTECTED] wrote: Run your command through the time program. You can parse the output format of time, or set a custom output format. This mostly applies to Unix-like systems but there is probably an equivalent somewhere on Windows. Preston Thanks for the quick answer. That seems to work, though, I'll write a timesubprocess() function which runs the program through time and spits the formatted out to a file, then parses that file, then returns the execution time. There doesn't appear to be a more elegant way to do this. Kevin subprocess can do that easily. What about something like this? def timecall(args): p = subprocess.Popen(['time', '--format', '%e %U %S'] + args, stderr=subprocess.PIPE) p.wait() timings = p.stderr.readline().split() assert len(timings) == 3 timings = tuple(float(t) for t in timings) return timings It returns (real, user, sys), in seconds. The program's stdout goes to sys.stdout, I don't know where the program's stderr goes, and it really doesn't handle errors, but it's got the basic idea. -- -- http://mail.python.org/mailman/listinfo/python-list
Re: Altering imported modules
On Sunday 02 March 2008, Paul McGuire wrote: On Mar 2, 3:48 pm, Tro [EMAIL PROTECTED] wrote: On Sunday 02 March 2008, Terry Reedy wrote: Tro [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] | Hi, list. | | I've got a simple asyncore-based server. However, I've modified the asyncore | module to allow me to watch functions as well as sockets. The | modified asyncore module is in a specific location in my project and | is imported as | usual from my classes. | | Now I'd like to use the tlslite library, which includes an asyncore | mixin class. However, tlslite imports asyncore, which doesn't | include my own modifications. | | I'd like to know if it's possible to make tlslite load *my* asyncore module | without changing any of the tlslite code. If your module is also 'asyncore' and comes earlier in the search path, I would expect the import to get yours. It's not. It has a package prefix like my.package.asyncore. I think I can either move my version of asyncore up a couple of levels or add the my.package directory to sys.path. My version of asyncore imports several functions from the built-in asyncore. Now that my version of it is imported as asyncore, how would it import the built-in version from python2.5/site-packages? Thanks, Tro What happens if you do import my.package.asyncore as asyncore? If that doesn't work (trying the simplest hack first), I know that there are various hooks in the import mechanism that should help. In the classes that use my version of asyncore currently, that is how I do it. I import my version as import my.package.asyncore as asyncore. In my asyncore module I do import asyncore, because I override a few functions from the asyncore module included with python. However, if I were to add my.package to sys.path, then I wouldn't be able to import asyncore from my own asyncore module. I'd have to do some trickery with sys.path to take the my.package component out, import standard asyncore, readd the my.package component, so that other modules can import asyncore and get my version. Is there a way to import the standard python asyncore module in this scenario? Thanks, Tro -- http://mail.python.org/mailman/listinfo/python-list
Re: News from Jython world
On Mar 3, 1:40 pm, Sébastien Boisgérault [EMAIL PROTECTED] wrote: Frank Wierzbicki and Ted Leung have been hired by Sun. Frank is a key Jython developer and is specifically hired to work full time on Jython, a version of the Python interpreter that runs on top of the JVM and provides full access to Java libraries. After a period where the development had slowed, Jython was recently getting seriously back on track. Now it's getting even better ! Don't wait too much ... Jython is very useful RIGHT NOW if you live in the Java Universe. More details at: -http://www.infoworld.com/article/08/03/03/hirings-python_1.html -http://fwierzbicki.blogspot.com/2008/02/jythons-future-looking-sunny Cheers, SB Great news! Having to go back to the Java world might not be such a turn-off in the near future ;-) George -- http://mail.python.org/mailman/listinfo/python-list
os.system with cgi
Hi,
I have the following peace of code
def getBook(textid, path):
url = geturl(textid)
if os.path.isfile(path + textid):
f = open(path + textid)
else:
os.system('wget -c ' + url + ' -O ' path + textid)
f = open(path + textid)
return f
The reason I am not using urllib is that I want to have random access within
the downloaded file.
When i execute the file from a regular python script I get the file
downloaded and a handle for the file returned.
When I execute the file from a python cgi script i get an error saying that
the file doesn't exist. In other words the call to os.system is not running.
Could someone please point out what the problem with that peace of code
running as a cgi script.
Best.
--
http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 4:08 pm, Robert Kern [EMAIL PROTECTED] wrote: Mensanator wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. Did you even try to figure it out? It took me all of 5 minutes to find the mistake. Could I trouble you to share? Then I could continue my testing. I posted it here because someone recommended it. I'm simply un-recommending it. It was a mistake, an easily remedied mistake, But I didn't know that (and still don't). not a big unchangeable design decision. I didn't know that either. For all I know, I might have to wait for the next version, and who knows when that will be? If you want to recommend against sympy as a package, there is a larger burden of proof that you have yet to meet. What kind of burden of proof must one have to recommend it in the first place? -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: os.system with cgi
G wrote:
Hi,
I have the following peace of code
def getBook(textid, path):
url = geturl(textid)
if os.path.isfile(path + textid):
f = open(path + textid)
else:
os.system('wget -c ' + url + ' -O ' path + textid)
f = open(path + textid)
return f
The reason I am not using urllib is that I want to have random access
within the downloaded file.
When i execute the file from a regular python script I get the file
downloaded and a handle for the file returned.
When I execute the file from a python cgi script i get an error saying
that the file doesn't exist. In other words the call to os.system is not
running.
Could someone please point out what the problem with that peace of code
running as a cgi script.
Best.
Ew. You could at least use subprocess and not be vulnerable to someone
passing ; rm -rf ~; echo or something as the path.
If you need random access like that, and urllib2 can't do it, you could
use urllib2 and a StringIO or temporary file or something.
Using wget makes it much harder to handle errors.
Heck, you could just read the file into a string and use slicing, if
it's not too large...
--
--
http://mail.python.org/mailman/listinfo/python-list
Re: Import, how to change sys.path on Windows, and module naming?
En Mon, 03 Mar 2008 14:39:20 -0200, [EMAIL PROTECTED] escribió: On 3 Mar, 17:12, [EMAIL PROTECTED] wrote: Oops... I tried removing python25.zip from sys.path, and I can still import packages from zip files ... Yes, python25.zip is in sys.path by default, not to enable zipimport (which is enabled by default, if zlib is available), but to allow the entire Python library to be distributed in a .zip When Python starts, it imports site.py (and a *lot* of other modules, too much for my taste); that script is responsible of building sys.path, adding lib/site-packages and looking for .pth files and so. Before that, sys.path contains a minimal set of dirs. If there were no .zip already in sys.path, site.py (and all the modules it uses) should exist on an actual directory already present on sys.path in order to be imported - so the entire library could not reside on a zip file. Having python25.zip in sys.path by default (*before* processing site.py) allows to distribute the whole std library (and possibly other packages too) in a single zip file. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
Mensanator wrote: On Mar 3, 4:08 pm, Robert Kern [EMAIL PROTECTED] wrote: Mensanator wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. Did you even try to figure it out? It took me all of 5 minutes to find the mistake. Could I trouble you to share? Then I could continue my testing. I posted the patch on the bug tracker: http://code.google.com/p/sympy/issues/detail?id=729 I posted it here because someone recommended it. I'm simply un-recommending it. It was a mistake, an easily remedied mistake, But I didn't know that (and still don't). not a big unchangeable design decision. I didn't know that either. For all I know, I might have to wait for the next version, and who knows when that will be? The point is that you didn't try to figure it out. And you assumed the worst rather than giving anyone the benefit of the doubt. You didn't even wait to get a response from the package maintainer about how serious the issue was before you came here to un-recommend it. All software has bugs. Good software has bugs. Finding a single bug in a package is not sufficient cause to warn people away as if it had the plague. If you want to recommend against sympy as a package, there is a larger burden of proof that you have yet to meet. What kind of burden of proof must one have to recommend it in the first place? Significantly less. It was useful to me, is sufficient. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 4:53 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 4:47 pm, Mensanator [EMAIL PROTECTED] wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 3:40 pm, Mensanator [EMAIL PROTECTED] wrote: Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it f***s up other modules. Dude, relax. It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. I posted it here because someone recommended it. I'm simply un-recommending it. Those who don't care needn't pay any attention. Those who do should be glad that faults are pointed out when found. 1. You can point out the faults of a program without insults and vulgarity Did I insult someone? And fuck in the context I used it means messes with. Now you know that the writer of that superbowl commercial for almonds wanted to say Robert Goulet fucks with your stuff. But, due to censorship, changed it to messes with. 2. You must be terribly difficult to please if one bug is enough to recommend against a program as worse than worthless While we're on the subject of English, the word worthless means has no value. So, a program that doesn't work would generally be worthless. One that not only doesn't work but creates side effects that cause other programs to not work (which don't have bugs) would be worse than worthless. I'm not hard to please at all. I'm planning a later report where I test sympy's factoring with that of the MIRACL library's factor.exe program. It too, has a serious bug (and I'm not a good enough C programmer to know how to fix it) but I have a Python based workaround even though the MIRACL library has no Python interface. But any mention I ever make of this program will mention this bug in case anyone wants to use it. 3. You must be terribly naive if you expect a freeware program with a version number of 0.5.12 not to have bugs No, but I guess I'm naive thinking that when someone posts a link to such a program that he's recommending going and trying it out. That is why they're making it available, isn't it? For people to try out so they can get free testing? Aren't I doing my part? Should I just uninstall it and forget it? Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 7:24 pm, Mensanator [EMAIL PROTECTED] wrote: On Mar 3, 4:53 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 4:47 pm, Mensanator [EMAIL PROTECTED] wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: On Mar 3, 3:40 pm, Mensanator [EMAIL PROTECTED] wrote: Notice anything funny about the random choices? import sympy import time import random f = [i for i in sympy.primerange(1000,1)] for i in xrange(10): f1 = random.choice(f) print f1, f2 = random.choice(f) print f2, C = f1*f2 ff = None ff = sympy.factorint(C) print ff ## 7307 7243 [(7243, 1), (7307, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] ## 8563 2677 [(2677, 1), (8563, 1)] ## 4091 6829 [(4091, 1), (6829, 1)] As in, they're NOT random. The random number generator is broken by the sympy.factorint() function. Random.choice() works ok if the factorint() function commented out. ## 6089 1811 None ## 6449 1759 None ## 9923 4639 None ## 4013 4889 None ## 4349 2029 None ## 6703 8677 None ## 1879 1867 None ## 5153 5279 None ## 2011 4937 None ## 7253 5507 None This makes sympy worse than worthless, as it f***s up other modules. Dude, relax. It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. I posted it here because someone recommended it. I'm simply un-recommending it. Those who don't care needn't pay any attention. Those who do should be glad that faults are pointed out when found. 1. You can point out the faults of a program without insults and vulgarity Did I insult someone? Yes, the intelligence of most people here, if you think anyone's going to buy your rationalization of your spiteful behavior. Four posts is more than enough of you. *PLONK* Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
Mensanator wrote: On Mar 3, 4:53 pm, Carl Banks [EMAIL PROTECTED] wrote: 3. You must be terribly naive if you expect a freeware program with a version number of 0.5.12 not to have bugs No, but I guess I'm naive thinking that when someone posts a link to such a program that he's recommending going and trying it out. That is why they're making it available, isn't it? For people to try out so they can get free testing? Aren't I doing my part? Should I just uninstall it and forget it? Finding the issue and reporting it to the sympy bug tracker is commendable. Coming here and un-recommending sympy before the issue was resolved is not. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Altering imported modules
On Mar 3, 5:09 pm, Tro [EMAIL PROTECTED] wrote: On Sunday 02 March 2008, Paul McGuire wrote: On Mar 2, 3:48 pm, Tro [EMAIL PROTECTED] wrote: On Sunday 02 March 2008, Terry Reedy wrote: Tro [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] | Hi, list. | | I've got a simple asyncore-based server. However, I've modified the asyncore | module to allow me to watch functions as well as sockets. The | modified asyncore module is in a specific location in my project and | is imported as | usual from my classes. | | Now I'd like to use the tlslite library, which includes an asyncore | mixin class. However, tlslite imports asyncore, which doesn't | include my own modifications. | | I'd like to know if it's possible to make tlslite load *my* asyncore module | without changing any of the tlslite code. If your module is also 'asyncore' and comes earlier in the search path, I would expect the import to get yours. It's not. It has a package prefix like my.package.asyncore. I think I can either move my version of asyncore up a couple of levels or add the my.package directory to sys.path. My version of asyncore imports several functions from the built-in asyncore. Now that my version of it is imported as asyncore, how would it import the built-in version from python2.5/site-packages? Thanks, Tro What happens if you do import my.package.asyncore as asyncore? If that doesn't work (trying the simplest hack first), I know that there are various hooks in the import mechanism that should help. In the classes that use my version of asyncore currently, that is how I do it. I import my version as import my.package.asyncore as asyncore. In my asyncore module I do import asyncore, because I override a few functions from the asyncore module included with python. However, if I were to add my.package to sys.path, then I wouldn't be able to import asyncore from my own asyncore module. I'd have to do some trickery with sys.path to take the my.package component out, import standard asyncore, readd the my.package component, so that other modules can import asyncore and get my version. Is there a way to import the standard python asyncore module in this scenario? Thanks, Tro- Hide quoted text - - Show quoted text - Are you trying to interfere with the default module on only your machine? Just rename it. If something in the std. lib. imports asyncore, they get yours too that way. -- http://mail.python.org/mailman/listinfo/python-list
Re: Beautiful Code in Python?
On Mar 3, 4:30 pm, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: On Mar 2, 1:18 pm, [EMAIL PROTECTED] wrote: On Mar 2, 12:01 pm, John DeRosa [EMAIL PROTECTED] wrote: On Mon, 3 Mar 2008 01:23:32 +0900, js [EMAIL PROTECTED] wrote: Hi, Have you ever seen Beautiful Python code? Zope? Django? Python standard lib? or else? Please tell me what code you think it's stunning. Just about any Python code I look at. Decorators, with, and namedtuple. IMO, decorators are functional but far from beautiful. They're a special, somewhat ugly syntax for something that was already handled by normal constructs (foo=classmethod(foo)) that you didn't need extra knowledge to understand. On balance I think it's worth it in order to get those declarations up by the function defs, but it's sort of a tradeoff of magical non- explicitness for pragmatism over purity. A worthwile tradeoff, but not what I'd ever call beautiful. Someone study architecture. What are the Palmer House, the Rookery, and the Lyric Opera? -- http://mail.python.org/mailman/listinfo/python-list
metaclasses
What are metaclasses? -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 6:21 pm, Robert Kern [EMAIL PROTECTED] wrote: Mensanator wrote: On Mar 3, 4:08 pm, Robert Kern [EMAIL PROTECTED] wrote: Mensanator wrote: On Mar 3, 2:49 pm, Carl Banks [EMAIL PROTECTED] wrote: It's just a bug--probably sympy is messing with the internals of the random number generator. It would be a simple fix. Instead of bing about it, file a bug report. I did. Or better yet, submit a patch. I would if I knew what the problem was. Did you even try to figure it out? It took me all of 5 minutes to find the mistake. Could I trouble you to share? Then I could continue my testing. I posted the patch on the bug tracker: http://code.google.com/p/sympy/issues/detail?id=729 Thanks, I think I actually figured out how to use it. I posted it here because someone recommended it. I'm simply un-recommending it. It was a mistake, an easily remedied mistake, But I didn't know that (and still don't). not a big unchangeable design decision. I didn't know that either. For all I know, I might have to wait for the next version, and who knows when that will be? The point is that you didn't try to figure it out. Give me a break, I'm not a developer, just an end user. And you assumed the worst Wasn't my assumption correct? That it really was messing outside it's domain? rather than giving anyone the benefit of the doubt. As in maybe it only fails for me? Was I crying that the sky was falling? You didn't even wait to get a response from the package maintainer I have no experience with those web sites. I think this is the first time I was able to successfully report a bug and have no clue what the turnaround time is. about how serious the issue was The symptom was serious although the fix was simple. before you came here to un-recommend it. As an end user, I get most of my information here. Since I saw the link to sympy here on this newsgroup, I thought it would be irresponsible to file a bug report without simultaneously mentioning it here. All software has bugs. Good software has bugs. Are bugs off-topic here? Finding a single bug in a package is not sufficient cause to warn people away as if it had the plague. It DID have the plague. It affected anything else that tried to use random numbers. If you want to recommend against sympy as a package, there is a larger burden of proof that you have yet to meet. What kind of burden of proof must one have to recommend it in the first place? Significantly less. It was useful to me, is sufficient. Really? That's sufficient? Ok, but how is my pointing out a verifyable problem that affects the entire system not a sufficient burden of proof against recommending the package? Or should I just have worded it differently? Aren't I at least going to get credit for having found it? -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
On Mar 3, 6:49 pm, Robert Kern [EMAIL PROTECTED] wrote: Mensanator wrote: On Mar 3, 4:53 pm, Carl Banks [EMAIL PROTECTED] wrote: 3. You must be terribly naive if you expect a freeware program with a version number of 0.5.12 not to have bugs No, but I guess I'm naive thinking that when someone posts a link to such a program that he's recommending going and trying it out. That is why they're making it available, isn't it? For people to try out so they can get free testing? Aren't I doing my part? Should I just uninstall it and forget it? Finding the issue and reporting it to the sympy bug tracker is commendable. Coming here and un-recommending sympy before the issue was resolved is not. Bad choice of words I guess. I'll try to keep that in mind. -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
tools to install not in python tree?
Hello, I have some materials for a project that I am working on that I keep in a source code control system (svn now, but I'm experimenting with mercurial). I want to install these things from the repository, but not into site-packages/ as Distutils wants to do. For instance there are some administrative scripts I want to put in ~/ admin/ and some programs that I want in ~/public_html/ . I also want to run some post-install routines (for instance, reset the database tables on my development machine). So I'm looking for a tool to take things from a repository and install them into place. Something like: install_from_repository.py -version 1.2.7 if there is a bug in 1.2.7 that I need to work on. Some of the things that I am looking for are like what setup.py does (for instance, changing the #! line on scripts or having a convenient .cfg file). But as I understand it setup only targets installing below sys.prefix; is that right? I can write routines for myself but other people must need to do these things also and a tested solution is obviously better. Is there such a tool? Thanks for any help, Jim -- http://mail.python.org/mailman/listinfo/python-list
Re: metaclasses
What are metaclasses? http://www.google.com/search?q=python+metaclass HTH, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: sympy: what's wrong with this picture?
All software has bugs. Good software has bugs. Therefore, good software is software. This makes sympy worse than worthless, as it f***s up other modules. What is it still good for? -- http://mail.python.org/mailman/listinfo/python-list
'normal' shell with curses
Hi, I'm trying to print out text in color. As far as I know, curses is the only way to do that (or not?). So, what I ultimately want is a curses terminal that behaves as closely as possible as a normal terminal, i.e. it breaks lines and scrolls automatically, so that I can implement a function myprint(color, text) that does what print() does, only in color. So, my first tests brought up some problems: #!/usr/bin/python from time import sleep import curses import sys stdscr = curses.initscr() stdscr.addstr(Initialized\n) stdscr.refresh() (maxlines, maxcolumns) = stdscr.getmaxyx() try: for counter in xrange(24): stdscr.addstr(Hello world %s\n % counter) stdscr.refresh() if counter = maxlines: stdscr.scroll() stdscr.refresh() except Exception, data: sys.stderr.write(Exception: \n); sys.stderr.write(str(data)); finally: sleep(5) curses.endwin() Instead of scrolling, the program throws an exception. Any hints? Also, is there a way leave the curses output on the screen after curses.endwin(), instead of returning to the normal terminal without a trace of curses. Thanks, Michael -- http://mail.python.org/mailman/listinfo/python-list
Re: _struct in Python 2.5.2
On Feb 24, 10:39 am, Olaf Schwarz [EMAIL PROTECTED] wrote: Hi, I am trying to run this applicationhttp://svn.navi.cx/misc/trunk/python/bemused/ on uNSLUng Linux 6.10 using the optware python packages. As I obtained segmentation faults using Python 2.4, I have upgraded to 2.5.2. Now the execution terminates a lot earlier with this error message: File /usr/local/bemused_mpd/bemused-mpd.py, line 33, in module import bemused File /usr/local/bemused_mpd/bemused.py, line 27, in module import bluetooth, syslog File /opt/lib/python2.5/site-packages/bluetooth.py, line 2, in module import struct File /opt/lib/python2.5/struct.py, line 30, in module from _struct import Struct, error ImportError: No module named _struct I found out that there has been a file named _struct.so in 2.5.1 but it has disappeared in 2.5.2. With no package available for downgrading to 2.5.1 and no idea how to resolve this I am stuck at this point. Any help appreciated. Thank you Olaf Hi Olaf, If you are still stuck, run ./configure make make install if you skip the command make, then the required files (python-install- pathlib/python2.5/lib-dynload/_struct.so) doesn't get created. Get the latest 2.5.2 rpm from python.org, it works. Good luck. -N -- http://mail.python.org/mailman/listinfo/python-list
