mike_wilson1333:
I would like to generate every unique combination of numbers 1-5 in
a 5 digit number [...] What would be the best way to do this?
Ask the Java newsgroup to design a clever algorithm and post it here for
pythonification. Ask for the pseudocode, not the Java code.
--
René
Stargaming:
Generally, it is range(1, 5)
Minus all numbers whose decimal string representation matches
[0-9]*[06-9][0-9]* Briljant!
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Kingsley:
it just sits in either the urlopen() or read() forever.
[...]
I would have thought that some urllib-internal timeout
would fix this?!
Yes, but you'll need to enable it. See socket.setdefaulttimeout() :
http://docs.python.org/lib/module-socket.html
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[EMAIL PROTECTED]:
In python , how to implement interface like the above?
Interfaces are lacking in Python, but an even more generic proposal is on
its way:
http://www.artima.com/weblogs/viewpost.jsp?thread=155123
In the mean time, interfaces have already been implemented in Zope 3:
Bruno Desthuilliers:
Java interfaces are a workaround
Troll alert.
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Dan Stromberg:
What's the deal here?
The sketchy information in your post doesn't rule out any possibility.
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Bo Yang:
[Fri Jun 16 14:06:45 2006] [error] [client 10.10.110.17] malformed
header from script. Bad header=Hello World!: a.py
The output of a CGI script should consist of two sections, separated by a
blank line. The first section contains a number of headers, telling the
client what kind of data
Tgone:
I have some custom PHP functions that I didn't want to re-write in
Python. But maybe I should just rewrite them :)
Absolutely.
The alternative is one of many IPC mechanisms that are available in both
Python and PHP (such as XML-RPC). But that may require more effort than
rewriting the
Ilias Lazaridis:
What is the credibility and value of the provided wikipedia entry?
Wikipedia always tells the Absolute Truth, because if it doesn't, we can
edit it and fix it right away.
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Tommy B:
I was wondering if there was a way to take a txt file and, while
keeping most of it, replace only one line.
You'd need to read the file and parse it, to find the start position of
the line you want to change. Then seek output to that position and write
and flush the changes. You must
bruno at modulix:
You can't do this in place with a text file (would be possible with a
fixed-length binary format).
More precise: it's possible with any fixed-length change, in both binary
and text files, with both fixed and variable formats.
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[EMAIL PROTECTED]:
I wrote a program that takes an XML file into memory using Minidom. I
found out that the XML document is 10gb.
I clearly need SAX or something else?
Any suggestions on what that something else is?
PullDOM.
http://www-128.ibm.com/developerworks/xml/library/x-tipulldom.html
[EMAIL PROTECTED]:
I have an application return in python. I want this to be
converted to C.
http://www.python.org/doc/faq/general/#can-python-be-compiled-to-machine-code-c-or-some-other-language
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RJ:
import random
flip = random.randrange(2)
heads = 0
tails = 0
count = 0
while count 100:
if flip == 0:
heads += 1
else:
tails += 1
count += 1
Since flip isn't changed in the loop, this is going to report 100 heads or
100 tails, depending on
Petr Jakes:
What about unexpected exceptions? :(
I asked a similar question some time ago:
http://groups.google.nl/group/comp.lang.python/browse_thread/thread/25963b99da4b2653
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[EMAIL PROTECTED]:
are there any specific groups for zope / plone regarding questions?
Try plone-users: http://plone.org/support
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Fredrik Lundh:
Rene Pijlman:
[end tag in html comment in script element]
The end tag it chokes on is in comment, isn't it?
no. STYLE and SCRIPT elements contain character data, not parsed
character data, so comments are treated as characters, and the first
/ ends the element.
Ah, I see. I'll
Miki:
You can also check out BeautifulSoup
(http://www.crummy.com/software/BeautifulSoup/) which is less strict
than the regular HTML parser.
Yes, thanks. Ik this case it was my sitechecker which checks for syntax
and broken links, so it was supposed to find the syntax error.
BeautifulSoup is not
The code below results in an exception (Python 2.4.2):
HTMLParser.HTMLParseError: bad end tag: /foo' + 'bar, at line 4,
column 6
Should it? The end tag it chokes on is in comment, isn't it?
import HTMLParser
HTMLParser.HTMLParser().feed(
htmlheadtitle/title/headbodyscript
!--
x = '/foo' + 'bar'
Rocco:
but does not work with 2.4.3.
Define does not work.
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malv:
Did anybody get this recipe to work?
Did you?
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malv:
At the statement b = Bar(), the following error occurs:
The debugged program raised the exception unhandled AttributeError
type object 'Bar' has no attribute '__instance_refs__'
I haven't studied it at all, but the code on
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/160164 seems
Jack:
I have to run the installer to install dozens of directories and
hundreds of files,
That's not unusual and not considered a problem by most people.
and I don't really know if all of them are necessary.
Don't let that bother you. Life's too short.
Plus, lots of libraries are in .py,
[EMAIL PROTECTED]:
with urllib2 it doesn't seem possible to get HTTP status codes.
except urllib2.HTTPError, e:
if e.code == 403:
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[EMAIL PROTECTED]:
Rene Pijlman wrote:
[EMAIL PROTECTED]:
with urllib2 it doesn't seem possible to get HTTP status codes.
except urllib2.HTTPError, e:
if e.code == 403:
Thanks. Is there documentation for this available somewhere online, I
can't see it to obviously
Fredrik Lundh:
PATH is used by the operating system to find executables, and PYTHONPATH
is used by Python to find Python modules.
Yes, but Python also finds modules in its own installation. So changing
PATH may cause another installation of Python to be run, which may have
some other set of
Luis P. Mendes:
I'm developing a django based intranet web server that has a search page.
Data contained in the database is mixed. Some of the words are
accented, some are not but they should be. This is because the
collection of data began a long time ago when ascii was the only way to go.
Gary Wessle:
tx = now 04/30/2006 then
data = re.compile('(\d{2})/\1/\1\1', re.IGNORECASE)
d = data.search(tx)
print d
Nono
I was expecting 04/30/2006
You should expect: NameError: name 're' is not defined
what went wrong?
\1 matches the content of the first group, which is '04'. It doesn't
John Salerno:
I always read about how you need to set certain file permissions (for
cgi files, for example), but it's never been clear to me *how* you do
this. I know you can run the line
chmod 755 scriptname.py
but *where* do you run this?
This is a Unix/Linux command. You run it in a shell
[EMAIL PROTECTED]:
I was wondering if anyone knew of a built in Python function that will
check if an item is a member of a list, i.e., if item i is a member of
list l.
1 in [1,3,4]
True
2 in [1,3,4]
False
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Micah:
I'd like a full-featured tree
What features?
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[EMAIL PROTECTED]:
I was wondering, why you always have to remember to call bases'
constructors explicitly from the derived class constructor? Why hasn't
this been enforced by the language?
Probably because the language doesn't know whether the subclass wants to
override its base class's
[EMAIL PROTECTED]:
I think I'll need some shift in thinking after C++.
+1 qotw
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Steve Juranich:
is there some big master diff, along the lines of What's new
in Python X.X that I could look at to get an idea of what z3 has that 2.9
(which I'm currently still cutting my teeth on) doesn't?
It's a redesign.
Z2: mixin base classes
Z3: component architecture with interfaces
gangesmaster:
(i forgot to say it didn't work)
It's the remaining threads that need to be daemon, when some thread
performs sys.exit. When no non-daemon thread remains, the application
terminates.
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[EMAIL PROTECTED]:
i have discovered that the server will send a request for the heartbeat
ping if its almost timed out, so i use the length of the message to
determine what to do with it.
msg = sockobj.recv(1024)
if len(msg) == 158:
record the data
elif len(msg) == (34): # length of request
[EMAIL PROTECTED]:
i have a script that waits for message packets from a data server over
a socket.
Using what network protocol?
it works fine for a while, but the server requires that i send a
heartbeat ping every 600 seconds or it will terminate the connection.
[...]
should i do this with
harold:
The output (when given the data I want to parse) is:
If you'd told us that data, and told us what version of Python you're
using, we could have reproduced the problem to look into it.
ValueError: need more than 3 values to unpack
Why does python think that I want to unpack the outcome
harold:
A similar error happens in an interpreter session, when typing
for line in [1 2 3 4] :
...for a,b,c,d in line.split() :
...pass
...
Traceback (most recent call last):
File stdin, line 2, in ?
ValueError: need more than 1 value tyo unpack
maybe this might help to track down
Julien ARNOUX:
I have a problem :), I just want to extract text from pdf file with
python. There is differents libraries for that but it doesn't work...
pyPdf and pdfTools, I don't know why but it doesn't works with some
pdf...
Text can be represented in different ways in PDF: as tagged text,
Tim Chase:
Is there an obvious/pythonic way to remove duplicates from a
list (resulting order doesn't matter,
Use a set.
http://www.python.org/doc/lib/types-set.html
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Kay Schluehr:
You won't find many deep class hierarchies and extensive frameworks.
Zope comes to mind.
This has the advantage that a classification you have done once at
the beginning of your project in the design phase is not considered
to be carved in stone.
Zope 3 comes to mind.
--
Alex Martelli:
PEAK is an interesting counterexample, particularly since Philip Eby
tends to be ahead of the curve:
I never noticed PEAK before. Is it well worth studying?
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Neal Becker:
I see various answers that Python doesn't need interfaces. OTOH, there are
responses that some large Python apps have implemented them (e.g., zope).
Does anyone have an explanation of why these large systems felt they needed
to implement interfaces?
A programming language doesn't
[EMAIL PROTECTED]:
If it looks like a duck, and quacks like a duck, then for all practical
purposes it supports the 'duck' interface.
The problem with that of course, is that there's much more to being a duck
than being called 'duck'.
public interface JarFile {
void explode();
}
public
Grzegorz ¦lusarek:
I sending email using standard python modules smtplib, email,
coding email in utf but subject of message is not coded properly. In
subject i use my national characters (polish) and after send i get XX in
place these characters.
Here is the code
Message =
Bas:
just out of curiosity, is there a list of all the syntactic sugar that
is used in python?
http://docs.python.org/ref/specialnames.html
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WENDUM Denis 47.76.11 (agent):
While testing recursive algoritms dealing with generic lists I stumbled
on infinite loops which were triggered by the fact that (at least for my
version of Pyton) characters contain themselves.
No, strings contain characters. And 'a' is a string consisting of one
Arne:
I want to connecto to a ftp server. There I woult like to read the
directiroy and getting the filename, file owner and the file size.
How can I do this in python
http://docs.python.org/lib/module-ftplib.html
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Lawrence D'Oliveiro:
I've been using HTMLParser to scrape Web sites. The trouble with this
is, there's a lot of malformed HTML out there. Real browsers have to be
written to cope gracefully with this, but HTMLParser does not.
There are two solutions to this:
1. Tidy the source before parsing
Sakcee:
how can i get page response from a site e.g. google.com port 80
[...]
can i do at socket level?
Yes, but you'll need to implement HTTP:
http://www.ietf.org/rfc/rfc2616.txt
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[EMAIL PROTECTED]:
Can I use Pickle to store about 500,000 key value pairs..
Performance would be horrible. Use a BTree in ZODB instead:
http://www.zope.org/Wikis/ZODB/guide/node6.html#SECTION00063
or should I use mySql.
You should use a relational database, such as PostgreSQL,
Bror Johansson:
I have a class-hierarchy (fairly deep and fairly wide).
Is there a good and general way to test an instance-object obj for having a
class belonging to a certain sub-tree of the hierarchy with a common
parent class C?
isinstance(obj,C)
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I. Myself:
I can't get this to work
With what versions of what software on what platform?
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mwql:
Hey guys, this maybe a stupid question, but I can't seem to find the
result anywhere online. When is the right time to use 'is' and when
should we use '=='?
http://docs.python.org/ref/comparisons.html
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Terry Reedy:
The Python specification allows but does not require such behind-the-scenes
implementation optimization hacks. As released, CPython 2.4 caches -5 to
99, I believe. In 2.5, the upper limit was increased to 256. The limits
are in a pair of #define statements in the int object
Tony Burrows:
With something like Java I can find the syntax of a method call with no
problems, how do I do the same with Python?
The basic syntax is just the name, with parameters in brakcets:
object.method(par1, par2, ...)
This is explained in the documentation, of course.
how do I find
Aahz:
If you were going to name three or five essential recipes from the
Python Cookbook suitable for beginners, what would you pick?
Yes, this is for _Python for Dummies_, so idioms that aren't in the
Cookbook are also fine.
Constants
Static methods / Class methods
Bunch
TaskQueue (Queue for
Gerard Flanagan:
* To create an empty __init__.py file I do 'vim __init__.py' then
immediately exit vim, is there a shell or vim command which will create
an empty file without opening the editor?
touch __init__.py
* cd ~ brings me to my home directory, is there a means by which I can
set up a
Dennis Lee Bieber:
Raymond Hettinger:
Because of the GIL, thread pools are not as useful in Python as you
might expect -- they execute one at a time and do not take advantage of
hyper-threading or multiple processors. If that kind of efficiency is
If the task is I/O bound (something
DataSmash:
I'm confused. Why is it that when I say while len(list) 5:, I get
5 items in my list.
Because the last time when len(list) was 5, the block of code following
the while executed and did something to the list to give it a length = 5
(otherwise the block of code would be executed again
Dan:
New to python. Running under windows xp. Need help getting started
writing COM server and client.
Highly recommended:
http://safari.oreilly.com/?XmlId=1-56592-621-8
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Raymond Hettinger:
There are some competing approaches. One is to attach sentinel objects
to the end of the line as a way for consumer threads to know that they
should shut down. Then a regular t.join() can be used to block until
the consumers threads have shut-down. This approach is
Carl Banks:
Rene Pijlman:
for i in range(self.numberOfThreads):
self.workQueue.put(None)
Or, you could just put one sentinel in the Queue, and subclass the
Queue's _get method not to take the sentinel out.
Ah yes, clever trick. But you'd have to worry about thread-safety
[EMAIL PROTECTED]:
I am new to python. How can I compare if 2 files has duplicate
entries in python?
What is an 'entry'?
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Sion Arrowsmith:
I've got an established client-server application here where there
is now a need to shovel huge amounts of data (structured as lists of
lists) between the two, and the performance bottleneck has become
the amount of time spent parsing XML
http://xmlsucks.org/
Anyone got any good
Carl Banks:
Rene Pijlman:
Ah yes, clever trick. But you'd have to worry about thread-safety of your
subclass though.
Queue worries about this for you. The Queue class only calls _get when
it has the queue's mutex, so you can assume thread safety when
subclassing it.
Ah yes, I overlooked
[EMAIL PROTECTED]:
I'm using windows, and from what I've tried, the setdefaulttimeout
function doesn't work on my machine.
It should. It does on mine.
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Per:
how to find whether there is/are common item(s) between two list
in linear-time?
To find items in common between two lists, make the first into a
dictionary and then look for items in the second in it.
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[EMAIL PROTECTED]:
Just wondering if anyone knows of a way to keep a function,
E.g. socket.gethostbyaddr(12.34.56.78),
From taking to long-if it's run for more than 1 second, the function
gethostbyaddr will be terminated?
import socket
socket.setdefaulttimeout(1)
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René Pijlman
Wat wil jij
Mudcat:
My initial thought was to put the data in large dictionaries and shelve
them (and possibly zipping them to save storage space until the data is
needed). However, these are huge files.
ZODB solves that problem for you.
http://www.zope.org/Wikis/ZODB/FrontPage
More in particular 5.3 BTrees
[EMAIL PROTECTED]:
I'm using Queue to send images from one thread to another, and some of
the images are not appearing in the consumer threadmaybe 1 in 3
arrive.
I find that hard to believe. Could there be a bug in your program,
somewhere, somehow?
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--
Rc:
My question is where can I find a compiler for free.
For Windows XP.
http://www.python.org/download/
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Kevin:
#!/usr/bin/python
import os
import urllib
os.system(python pyq.py ibm text1.txt)
Check the return value of os.system.
note: currently the text1.txt outputted is just blank, however if i run
the command normally as 'python pyq.py ibm' in the command line, it
works correctly and gives
[EMAIL PROTECTED]:
Is there any editor or IDE in Python (either Windows or Linux) which
has very good debugging facilites like MS VisualStudio has or something
like that.
Here's a recent thread about IDEs:
http://groups.google.nl/group/comp.lang.python/browse_frm/thread/fd9604e225252ad4
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René
Sullivan WxPyQtKinter:
I hope that an IDE should be featured with:
I use WingIDE 2.1.0 (beta1) and I'm pleased with it.
1. Grammar Colored highlights.
Yes, Wing does that.
2. Manage project in a tree view or something alike, ie, a project file
navigator.
Yes.
3. Code collapse and folding.
[EMAIL PROTECTED]:
Help please with a URLError.
Post your code (a small self-contained example, preferrably) and the URL.
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JuHui:
If a proxy is alive then return true, else return fals after 1 second.
What kind of proxy? Design pattern? Protocol? Which one?
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[EMAIL PROTECTED]:
Can you please tell me how Use python to process XML file?
The example I find is build a DOM, but I just need to do it in SAX
based, how can I do that?
http://docs.python.org/lib/module-xml.sax.html
http://pyxml.sourceforge.net/topics/howto/section-SAX.html
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René Pijlman
--
Bill:
In general I try to initialize the state of my objects as late as
possible, in the accessor. [...]
Is there a more Pythonic way of looking at this?
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/131495
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/363602
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Sullivan WxPyQtKinter:
Why do the three expression yield the same result abc?
Because all three converted ABC to lowercase, as per your request.
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[EMAIL PROTECTED]:
how can i copy text to the linux clipboard?
Linux is an operating system. It doesn't have a clipboard. The clipboard
is provided by desktop frameworks, such as KDE or Gnome.
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[EMAIL PROTECTED]:
can you do something like that in python?
All you did is show us some string literals, but I guess you're looking
for string substitution:
http://docs.python.org/lib/typesseq-strings.html
This can be simplified, they say:
Steven D'Aprano:
The OP is doing it because catching all exceptions masks bugs. There are
certain exceptions which should be allowed through, as they indicate a bug
in the OP's code. Normally the tactic is to catch only the exceptions you
are interested in, and let everything else through, but the
Astan Chee:
I was wondering if there is a way to maximize CPU usage
Fork a Java app :-)
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Roy Smith:
I like to create a top-level exception class to encompass all the
possible errors in a given module, then subclass that. This way, if you
want to catch anything to goes wrong in a call, you can catch the top-level
exception class without having to enumerate them all.
What do you
James Stroud:
Which suggests that try: except HTTPException: will be specific enough
as a catchall for this module.
The following, then, should catch everything you mentioned except the
socket timeout:
Your conclusion may be (almost) right in this case. I just don't like this
approach.
Peter Hansen:
Good code should probably have a very small set of real exception
handling cases, and one or two catchalls at a higher level to avoid
barfing a traceback at the user.
Good point.
A catchall seems like a bad idea, since it also catches AttributeErrors
and other bugs in the
Paul Rubin http://[EMAIL PROTECTED]:
We have to get Knuth using Python.
Perhaps a MIX emulator and running TeXDoctest on his books will convince
him..
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Steven D'Aprano:
ExpectedErrors = (URLError, IOError)
ErrorsThatCantHappen =
try:
process_things()
except ExpectedErrors:
recover_from_error_gracefully()
except ErrorsThatCantHappen:
print Congratulations! You have found a program bug!
print For a $327.68 reward, please send the
Jorge Godoy:
Rene Pijlman:
my app was surprised by an
httplib.InvalidURL since I hadn't noticed this could be raised by
robotparser (this is undocumented).
It isn't undocumented in my module. From 'pydoc httplib':
That's cheating: pydoc is reading the source :-)
What I meant was, I'm
Roy Smith:
In theory, all exceptions which represent problems with the external
environment (rather than programming mistakes) should derive from
Exception, but not from StandardError.
Are you sure?
The class hierarchy for built-in exceptions is:
Exception
+-- StandardError
|
John Pote:
I want to use python on a server to access incoming TCP port accesses. So I
need to use the socket interface which is new to me.
You may also want to look at Twisted:
http://twistedmatrix.com/trac/
Where can I get the various papers mentioned in the manual? And as I like
books
Luis P. Mendes:
I've developed a program that uses a socket to receive information 24h a
~ day.
The problem is that the socket seems to freeze. By that I mean the
program stops getting information but doesn't raise any error.
That's weird. There's probably a bug in your program.
I tried to
One of the things I dislike about Java is the need to declare exceptions
as part of an interface or class definition. But perhaps Java got this
right...
I've writen an application that uses urllib2, urlparse, robotparser and
some other modules in the battery pack. One day my app failed with an
SolaFide:
(get() is a function which waits for a ping on a specific port, thus
stopping the program for a while.)
Will these run together,
Thread 2 can run while thread 1 is blocked for I/O and v.v.
Also, is it possible to split off a program for the terminal that
started it? As in I type in
[EMAIL PROTECTED]:
I have a python script that pickles and unpickles a give object. It
works without any problems on windows (the data was pickled on windows
first). But when I try to run the script on Linux, I get the following
error:
[...]
ImportError: No module named __main__
There are some
Rene Pijlman:
[EMAIL PROTECTED]:
ImportError: No module named __main__
There are some posts in the Usenet archive
Also:
http://mail.python.org/pipermail/python-list/1999-April/000916.html
--
René Pijlman
--
http://mail.python.org/mailman/listinfo/python-list
Odd-R.:
I thought Exception would catch all exceptions.
Try this:
import sys
try:
pass # your code here
except:
e = sys.exc_value()
Either to catch everything, or to get a hold on e.
--
René Pijlman
--
http://mail.python.org/mailman/listinfo/python-list
Roy Smith:
How do you do any I/O in a functional language if side effects are
verboten?
The user is a function. Output is its parameter, input its return value.
The user is not allowed to maintain state ;-)
For that matter, how does a functional program ever stop running?
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