Re: Implicit initialization is EXCELLENT
Ian Kelly wrote: On Wed, Jul 6, 2011 at 12:49 AM, Ulrich Eckhardt ulrich.eckha...@dominolaser.com wrote: Mel wrote: In wx, many of the window classes have Create methods, for filling in various attributes in two-step construction. [...] Just guessing, is it legacy, C-with-classes code rather than C++ code perhaps? Haven't looked at wx for a while. Such code typically lacks understanding of exceptions, which are the only way to signal failure from e.g. constructors. No, wx is C++ through and through. No namespaces. No templates but macros. No exceptions. No C++. Sorry, I beg to differ. BTW, they say themselves that they tolerate but not use exceptions, so they actually need two-stage construction if construction can fail, and for exactly the guessed legacy reasons. http://wiki.wxpython.org/TwoStageCreation A C++ object is not a window, it is rather a proxy for managing the window. As such, it can be attached or detached from the underlying window, just like a std::fstream, so in this light it makes sense actually. Thanks for the link! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Re: web browsing short cut
Chris Angelico wrote: frameset rows=50%,50% frameset cols=50%,50% frame src=http://blah/blah; frame src=http://another/blah; /frameset frameset cols=50%,50% frame src=http://third/blah; frame src=http://final/blah; /frameset /frameset That should divide your screen four ways ( if I haven't botched my HTML - ages since I've used frames ). html !botched :-) An example of your frameset code http://csphx.net/fourpy.htm -- Stanley C. Kitching Human Being Phoenix, Arizona -- http://mail.python.org/mailman/listinfo/python-list
TypeError: unbound method DefaultTracer() must be called with MyClass instance as first argument (got str instance instead)
Hi Folks,
Here is something I don't fully understand.
1 def DefaultTracer(fmt, *args):
2 fmt = 'in DefaultTracer ' + fmt
3 print(fmt % args)
4 pass
5 def myTracer(fmt, *args):
6 fmt = 'in myTracer ' + fmt
7 print(fmt % args)
8
9 class MyClass:
10 ClassDefaultTracer = DefaultTracer
11 def __init__(self):
12 self.InstanceTracer = MyClass.ClassDefaultTracer
13 def trace(self, fmt, *args):
14 self.InstanceTracer(fmt, *args)
15
16
17 DefaultTracer(Testing %s, 'at first')
18 myTracer(Testing %s, 'at first')
19
20 MyClass().trace('Using ClassDefaultTracer')
21
22 # override ClassDefaultTracer for all new instances
23 MyClass.ClassDefaultTracer = myTracer
24 MyClass().trace('Using Overridden ClassDefaultTracer')
I want ClassDefaultTracer to store a reference to DefaultTracer and be
used by instances of MyClass. Why does line20 give me the following
error:
$ python foo.py
in DefaultTracer Testing at first
in myTracer Testing at first
Traceback (most recent call last):
File foo.py, line 20, in module
MyClass().trace('Using ClassDefaultTracer')
File foo.py, line 14, in trace
self.InstanceTracer(fmt, *args)
TypeError: unbound method DefaultTracer() must be called with MyClass
instance as first argument (got str instance instead)
Alternately, how can I achieve what I want, i.e. a class-wide default
used by all instances created off it, but
itself be changeable, so that once changed, the changed default would
be used by subsequent newer instances of that class.
Thanks,
Kannan
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Re: wx MenuItem - icon is missing
I can understand why it's frustrating but a menu items with icons on them aren't exactly common, so you're wandering into territory that's probably not so throughly explored (nor standard across platforms). Now that I think about it, I don't know that I've ever seen one under OSX, and I don't even know if it's supported at all. Maybe you are right, I'm not familiar with OS X. But they are common in GTK, Qt and Windows. Me, I would start by addressing the error in the traceback. wx doesn't seem happy with an orphan menu item; why not create a wx.Menu and assign the menu item to that? It might solve your icon problem; you never know. I did create it: menu = wx.Menu() # wx.Menu created here. item = wx.MenuItem(None,-1,uTest) item.SetBitmap(img.GetBitmap()) menu.AppendItem(item) # Item added to menu here. In defense of wxPython, we have three wx apps in our project and they contain very little platform-specific code. To be fair, we've had to rewrite some code after we found that it worked on one platform but not another, but generally we're able to find code that works on all platforms. We have only a couple of places where we were forced to resort to this kind of thing: if wx.Platform == __WXGTK__: do X elif wx.Platform == __WXMAC__: do Y etc. Hmmm then probably I'll have to install other OS too. :-) -- http://mail.python.org/mailman/listinfo/python-list
more advanced learning resources (code structure, fundamentals)
Hello, I've been programming in Python for a few years now. I have read most the typical learning resources, such as 'Dive Into Python', 'A Byte of Python', etc. In general I feel I have a good overview of the language. However, as I advanced toward trying to create more OO styled programs, I feel I am lacking some background on basic concepts. I have read 'Coding' and 'Beautiful Code', and while these provide good information on how to style and think about code, they haven't help me design classes, think about where and when to use inheritance, decorators, etc. The point is, most examples stop at demonstrating a single class, or show a trivial decorator example. What I am after is something that will help me design a program from scratch. What are the key points to the classes? Is it okay to reference or pass classes to instantiate a class? When would I want to use a decorator? How to decide which should be a static method, and if I need them at all? I know a lot of this would come from experience of working in a team, but unfortunately, I'm mostly running solo. I am starting to look more and more at source code too, which I find helpful, but the styles of programming vary significantly. Perhaps someone could say which modules have nice 'exemplary' code worth learning from? So, if someone has a good book or online reference, please point me to it. Other ideas too are most certainly welcome! Best, john -- View this message in context: http://old.nabble.com/more-advanced-learning-resources-%28code-structure%2C-fundamentals%29-tp32011481p32011481.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError: unbound method DefaultTracer() must be called with MyClass instance as first argument (got str instance instead)
Kannan Varadhan wrote:
Here is something I don't fully understand.
1 def DefaultTracer(fmt, *args):
2 fmt = 'in DefaultTracer ' + fmt
3 print(fmt % args)
4 pass
5 def myTracer(fmt, *args):
6 fmt = 'in myTracer ' + fmt
7 print(fmt % args)
8
9 class MyClass:
10 ClassDefaultTracer = DefaultTracer
11 def __init__(self):
12 self.InstanceTracer = MyClass.ClassDefaultTracer
13 def trace(self, fmt, *args):
14 self.InstanceTracer(fmt, *args)
15
16
17 DefaultTracer(Testing %s, 'at first')
18 myTracer(Testing %s, 'at first')
19
20 MyClass().trace('Using ClassDefaultTracer')
21
22 # override ClassDefaultTracer for all new instances
23 MyClass.ClassDefaultTracer = myTracer
24 MyClass().trace('Using Overridden ClassDefaultTracer')
I want ClassDefaultTracer to store a reference to DefaultTracer and be
used by instances of MyClass. Why does line20 give me the following
error:
$ python foo.py
in DefaultTracer Testing at first
in myTracer Testing at first
Traceback (most recent call last):
File foo.py, line 20, in module
MyClass().trace('Using ClassDefaultTracer')
File foo.py, line 14, in trace
self.InstanceTracer(fmt, *args)
TypeError: unbound method DefaultTracer() must be called with MyClass
instance as first argument (got str instance instead)
Functions written in Python are also descriptors, they have a __get__()
method. The seemingly harmless
whatever = MyClass.ClassDefaultTracer
therefore results in something like
whatever = MyClass.__dict__[ClassDefaultTracer].__get__(None, MyClass)
internally, and whatever becomes an unbound method, essentially the
DefaultTracer function wrapped in a check that its first argument is a
MyClass instance.
The simplest workaround is probably to spell out the dictionary access
whatever = MyClass.__dict__[ClassDefaultTracer]
If you want inheritance to work properly you need something more invoved,
perhaps (untested)
f = self.ClassDefaultTracer
try:
f = f.im_func
except AttributeError:
pass
self.InstanceTracer = f
or you wrap the callable in a descriptor:
def DefaultTracer(*args): print args
...
class D(object):
... def __init__(self, f):
... self.f = f
... def __get__(self, *args):
... return self.f
...
class MyClass(object):
... old = DefaultTracer
... new = D(DefaultTracer)
...
MyClass.old
unbound method MyClass.DefaultTracer
MyClass.new
function DefaultTracer at 0x7f0f1c0c45f0
m = MyClass()
m.old
bound method MyClass.DefaultTracer of __main__.MyClass object at
0x7f0f1cda6fd0
m.new
function DefaultTracer at 0x7f0f1c0c45f0
Not pretty, but in Python 3 the problem is gone...
Alternately, how can I achieve what I want, i.e. a class-wide default
used by all instances created off it, but
itself be changeable, so that once changed, the changed default would
be used by subsequent newer instances of that class.
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Re: Large number multiplication
Billy Mays wrote: On 07/06/2011 04:02 PM, Ian Kelly wrote: According to Wikipedia: In practice the Schönhage–Strassen algorithm starts to outperform older methods such as Karatsuba and Toom–Cook multiplication for numbers beyond 2**2**15 to 2**2**17 (10,000 to 40,000 decimal digits). I think most Python users are probably not working with numbers that large, and if they are, they are probably using specialized numerical libraries anyway, so there would be little benefit in implementing it in core. You are right that not many people would gain significant use of it. Even worse, most people would actually pay for its use, because they don't use numbers large enough to merit the Schönhage–Strassen algorithm. The reason I ask is because convolution has a better (best ?) complexity class than the current multiplication algorithm. The asymptotic complexity of algorithms (I guess that's what you mean) is concerned with large up to infinite n elements in operations. The claim there always excludes any number of elements below n_0, where the complexity might be different, even though that is usually not repeatedly mentioned. In other words, lower complexity does not mean that something runs faster, only that for large enough n it runs faster. If you never realistically reach that limit, you can't reap those benefits. That said, I'm sure that the developers would accept a patch that switches to a different algorithm if the numbers get large enough. I believe it already doesn't use Karatsuba for small numbers that fit into registers, too. I was more interested in finding previous discussion (if any) on why Karatsuba was chosen, not so much as trying to alter the current multiplication implementation. I would hope that such design decisions are documented in code or at least referenced from there. Otherwise the code is impossible to understand and argue about. Cheers! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
find max and min values from a column of a csv file
Hi All , Could any one help to get max and min values from a specified column of a csv file. The* csv file is large* and hence the below code did go bad. *Alternate methods would be highly appreciated ** minimum.py*: import csv filename = testLog_4.csv f = open(filename) def col_min(mincname): with open(filename, 'rb') as f: reader = csv.reader(f, delimiter=,) #print reader #print mincname col_index = next(reader).index(mincname) #print col_index least = min(rec[col_index] for rec in reader) print least col_min(str(Server Latency)) col_min(str(Client Latency)) f.close() *maximum.py:* import csv filename = testLog_4.csv f = open(filename) def col_max(maxcname): with open(filename, 'rb') as f: reader = csv.reader(f, delimiter=,) #print reader #print cname col_index = next(reader).index(maxcname) #print col_index highest = max(rec[col_index] for rec in reader) print highest col_max(str(Server Latency)) col_max(str(Client Latency)) f.close() Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: bash: testing whether anyone is or has recently been logged in?
On 2011-04-20, Bill Marcum wrote:
On 2011-04-20, Adam Funk a24...@ducksburg.com wrote:
I'd appreciate any suggestions for testing (preferably from a bash
script, although perl or python would be OK too) whether anyone is
currently logged in, and whether anyone has been logged in during the
past $N minutes.
(The idea is to use this in a cron script that only does its job when
the machine is not in live use.)
A script could parse the output of who, w or last, and the stored
output from previous commands.
[adding comp.lang.python]
Here's what I came up with in python. If you call it with no
arguments or with 0 as the argument, it gives a 0 exit code if no-one
is logged in. If you call it with a non-zero argument N, it gives a 0
exit code if no-one has been logged in in the past N minutes.
I welcome suggestions, corrections, c.
#v+
#!/usr/bin/python
# -*- coding: utf-8 -*-
import subprocess, re
from dateutil.parser import *
from sys import stdout, stderr, argv
from datetime import datetime, timedelta
from optparseimport OptionParser
oparser = OptionParser(usage=usage: %prog [options] [N])
oparser.add_option(-v, dest=verbose, default=False, action=store_true,
help=Verbose output)
(options, args) = oparser.parse_args()
query = 0
try:
if len(args) 0:
query = int(args[0])
except ValueError:
stderr.write('Invalid argument %s\n' % argv[1])
exit(-1)
if (options.verbose):
stdout.write('query %i\n' % query)
last_proc = subprocess.Popen(args=['last'], stdout=subprocess.PIPE)
last_out = last_proc.stdout.read().split('\n')
still_logged = re.compile(r'still logged in')
line_pattern = re.compile(r'^\S+\s+\S+\s+\S+\s+(\S+\s+\S+\s+\S+) ..:.. -
(..:..)\s+.*$')
timestamps = [];
minutes = 1
for line in last_out:
if line.startswith('reboot'):
pass
elif still_logged.search(line):
minutes = 0
if (options.verbose):
stdout.write('still logged in\n')
break
else:
matcher = line_pattern.match(line)
# user term host Tue Apr 26 13:49 - 14:52 (01:02)
if matcher:
date_string = matcher.group(1) + ' ' + matcher.group(2)
timestamp = parse(date_string)
stdout.write('d ' + date_string + ' -- ' + str(timestamp) +
'\n')
timestamps.append(timestamp)
if len(timestamps) 0:
latest = max(timestamps)
stderr.write(str(latest) + '\n')
now = datetime.now()
delta = now - latest
minutes = delta.days * 24 * 60 + delta.seconds / 60
diff_value = query + 1 - minutes
exit_value = max (0, diff_value)
if (options.verbose):
stdout.write('min %i\n' % minutes)
stdout.write('diff %i\n' % diff_value)
stdout.write('exit %i\n' % exit_value)
exit(exit_value)
#v-
--
I worry that 10 or 15 years from now, [my daughter] will come to me
and say 'Daddy, where were you when they took freedom of the press
away from the Internet?' [Mike Godwin]
http://www.eff.org/
--
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Re: find max and min values from a column of a csv file
I think you would benefit from reading the data into a numpy array first, then using numpy min, max functions. prakash jp wrote: Hi All , Could any one help to get max and min values from a specified column of a csv file. The* csv file is large* and hence the below code did go bad. *Alternate methods would be highly appreciated ** minimum.py*: import csv filename = testLog_4.csv f = open(filename) def col_min(mincname): with open(filename, 'rb') as f: reader = csv.reader(f, delimiter=,) #print reader #print mincname col_index = next(reader).index(mincname) #print col_index least = min(rec[col_index] for rec in reader) print least col_min(str(Server Latency)) col_min(str(Client Latency)) f.close() *maximum.py:* import csv filename = testLog_4.csv f = open(filename) def col_max(maxcname): with open(filename, 'rb') as f: reader = csv.reader(f, delimiter=,) #print reader #print cname col_index = next(reader).index(maxcname) #print col_index highest = max(rec[col_index] for rec in reader) print highest col_max(str(Server Latency)) col_max(str(Client Latency)) f.close() Thanks -- http://mail.python.org/mailman/listinfo/python-list -- View this message in context: http://old.nabble.com/find-max-and-min-values-from-a-column-of-a-csv-file-tp32011861p32012126.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: more advanced learning resources (code structure, fundamentals)
John [H2O] wrote: [ ... ] What are the key points to the classes? Is it okay to reference or pass classes to instantiate a class? Yes. The standard library does this in BaseHTTPServer (via its parent SocketServer.) Maybe looks abstruse at the outset, but it's the natural way to assign a fresh message handler to a new input message. Docs are via the Python Global Module Index, source is in some directory like /usr/lib/python2.6/SocketServer.py , .../BaseHTTPServer.py , etc. Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
Mel mwil...@the-wire.com writes: def file_to_hash(path, m = hashlib.md5()): hashlib.md5 *is* called once; that is when the def statement is executed. Very interesting, I certainly wasn't clear on this. So after that def, the created hashlib object is in the module's scope and can be accessed via file_to_hash.__defaults__[0]. -- http://mail.python.org/mailman/listinfo/python-list
blist question
hi all, I feel lack of native Python lists operations (e.g. taking N greatest elements with the involved key function and O(n) speed) and occasionally found blist http://pypi.python.org/pypi/blist/ Its entry says it is better than Python list. Did anyone ensure? Will it ever be merged into Python source code? D. -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
Anssi Saari a...@sci.fi writes:
Mel mwil...@the-wire.com writes:
def file_to_hash(path, m = hashlib.md5()):
hashlib.md5 *is* called once; that is when the def statement is executed.
Very interesting, I certainly wasn't clear on this. So after that def,
the created hashlib object is in the module's scope and can be
accessed via file_to_hash.__defaults__[0].
This also why you have to be a bit careful if you use e.g. [] or {} as a
default argument - if you then modify these things within the function
you might not end up with what you expect - it's the same list or
dictionary each time the function is called. So to avoid that kind of
thing you end up with code like:
def foo(bar=None):
if bar is None:
bar = []
...
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Re: find max and min values from a column of a csv file
prakash jp wrote:
Could any one help to get max and min values from a specified column of a
csv file. The* csv file is large* and hence the below code did go bad.
*Alternate
methods would be highly appreciated
**
minimum.py*:
import csv
filename = testLog_4.csv
f = open(filename)
def col_min(mincname):
with open(filename, 'rb') as f:
reader = csv.reader(f, delimiter=,)
#print reader
#print mincname
col_index = next(reader).index(mincname)
#print col_index
least = min(rec[col_index] for rec in reader)
print least
col_min(str(Server Latency))
col_min(str(Client Latency))
f.close()
I don't see a way to make this much faster as it is probably already i/o-
bound. You can try and calculate all four extrema at once, so you have to
iterate over the file only once:
$ cat csv_minmax_chunked.py
#!/usr/bin/env python
import csv
import locale
from itertools import islice
def make_key(index, type):
def key(row):
return type(row[index])
return key
class Aggregator(object):
def __init__(self, name, index, type, key=None):
self.name = name
self.index = index
self.type = type or float
self.getvalue = make_key(index, type)
self.key = {key: key} if key is not None else {}
def __repr__(self):
return {0}(name={1}, index={2}, type={3}.format(
type(self).__name__, self.name, self.index, self.type)
def __str__(self):
try:
return %s: %s...%s % (self.name, self.min, self.max)
except AttributeError:
return %s: (no values) % self.name
def update(self, rows):
values = map(self.getvalue, rows)
chunkmin = min(values, **self.key)
chunkmax = max(values, **self.key)
try:
curmin = self.min
curmax = self.max
except AttributeError:
self.min = chunkmin
self.max = chunkmax
else:
self.min = min(curmin, chunkmin, **self.key)
self.max = max(curmax, chunkmax, **self.key)
def identity(s):
return s
convert = {
float: (float,),
int: (int,),
text: (lambda s: s, locale.strxfrm),
: (identity,)
}
def main():
locale.setlocale(locale.LC_ALL, )
import argparse
parser = argparse.ArgumentParser()
parser.add_argument(csvfile)
parser.add_argument(columns, nargs=+)
parser.add_argument(--chunksize, -s, type=int, default=2**12)
args = parser.parse_args()
ntpairs = (column.partition(:)[::2] for column in args.columns)
with open(args.csvfile, rb) as instream:
rows = csv.reader(instream)
header = dict((name, index) for index, name in
enumerate(next(rows)))
aggregators = [
Aggregator(
{0}({1}).format(name, type or str),
header[name],
*convert[type])
for name, type in ntpairs]
chunksize = args.chunksize
while True:
chunk = list(islice(rows, chunksize))
if not chunk:
break
for agg in aggregators:
agg.update(chunk)
for agg in aggregators:
print agg
if __name__ == __main__:
main()
$ head sample.csv
alpha,beta,gamma,delta
69,-454,460960,ELIJAH
92,796,278885,SUFFICIENCY
42,895,934523,PIONEERED
88,-213,360633,reassert
63,-518,327010,mcmahon
84,604,540764,deprecatory
83,117,621832,VEGETARIANISM'S
61,411,844243,tan
29,-147,982043,plushest
$ ./csv_minmax_chunked.py sample.csv alpha:int beta:int beta gamma:float
delta delta:text
alpha(int): 0...99
beta(int): -1000...999
beta(str): -1...999
gamma(float): 0.0...97.0
delta(str): AALIYAH...études
delta(text): a...ZYUGANOV'S
--
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Re: TypeError: unbound method DefaultTracer() must be called with MyClass instance as first argument (got str instance instead)
Kannan Varadhan wrote:
Hi Folks,
Here is something I don't fully understand.
1 def DefaultTracer(fmt, *args):
2 fmt = 'in DefaultTracer ' + fmt
3 print(fmt % args)
4 pass
5 def myTracer(fmt, *args):
6 fmt = 'in myTracer ' + fmt
7 print(fmt % args)
Please don't post code with line numbers. That makes it difficult to copy
and paste your function into an interactive session, so that we can run it
and see what it does.
[...]
I want ClassDefaultTracer to store a reference to DefaultTracer and be
used by instances of MyClass. Why does line20 give me the following
error:
$ python foo.py
in DefaultTracer Testing at first
in myTracer Testing at first
Traceback (most recent call last):
File foo.py, line 20, in module
MyClass().trace('Using ClassDefaultTracer')
File foo.py, line 14, in trace
self.InstanceTracer(fmt, *args)
TypeError: unbound method DefaultTracer() must be called with MyClass
instance as first argument (got str instance instead)
Unfortunately you've run into a side-effect of one of the very few Do What
I Mean aspects of Python: under many circumstances, storing a function in
a class automatically turns it into a method. This is almost always what
you want, but not this time.
Here's a simple example:
def function(s):
... print s
...
class C(object):
... func = function
... print func, type(func)
...
function function at 0xb7f892cc type 'function'
print C.func, type(C.func)
unbound method C.function type 'instancemethod'
How to interpret this:
The class block is an executable statement which is executed at runtime.
During that execution, print func is called, and it sees func is an
actual function object.
After the block finishes executing, a class object (also called a type) is
created. This is where the DWIM behaviour happens: function attributes are
automatically turned into methods. That's normally what you want, but in
this case, it gives you the surprising result:
C.func(hello world)
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unbound method function() must be called with C instance as first
argument (got str instance instead)
Instead of calling it from the class C, you can call it from an instance:
c = C()
c.func(hello world)
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: function() takes exactly 1 argument (2 given)
Two arguments? What? Where's the second argument???
But wait: *bound* methods automatically get the instance as their first
argument. (When you define a method in the class, you write a function
with self as the first argument.) A bound method is one that is called
from an instance, not the class, and it gets the instance as first argument
automatically:
instance.method(args) # a bound method
is translated by Python into:
theclass = type(instance)
theclass.method(instance, args) # an unbound method
So if we do this, the method works:
c.func() # bound methods get the instance as first argument
__main__.C object at 0xb7f8fb6c
There are a couple of solutions to avoid this. One is to live with it:
def function(self, s): # Define this as if it were a method.
print s
class C(object):
func = function
Now you can call:
instance = C()
# unbound method, you are responsible for supplying self
C.func(instance, arg)
# bound method, Python supplies self
instance.func(arg)
but of course now you can't call function(arg) from outside the class.
Another solution is to use a staticmethod:
def function(s):
print s
class C(object):
func = staticmethod(function)
A third is to disguise the function:
class C(object):
func = (function,) # In a tuple
and then call C.func[0](arg)
but that's hideous. Don't do that.
Fourthly, the DWIM magic only happens when you store a function in the
*class*, not if you do it in the instance:
class C(object):
def __init__(self):
self.func = function
but now you can't call C.func because it doesn't exist, you have to
initialise an instance first.
Alternately, how can I achieve what I want, i.e. a class-wide default
used by all instances created off it, but
itself be changeable, so that once changed, the changed default would
be used by subsequent newer instances of that class.
class C(object):
default = staticmethod(function)
def __init__(self):
self.func = type(self).default
ought to do it.
--
Steven
--
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Re: TypeError: unbound method DefaultTracer() must be called with MyClass instance as first argument (got str instance instead)
Steven D'Aprano steve+comp.lang.pyt...@pearwood.info writes: Please don't post code with line numbers. That makes it difficult to copy and paste your function into an interactive session, so that we can run it and see what it does. C-x r d -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On 2011.07.06 06:16 PM, Steven D'Aprano wrote: Phlip wrote: Note the fix also avoids comparing to None, which, as usual, is also icky and less typesafe! Typesafe? Are you trying to make a joke? Maybe he has a duck phobia. Maybe he denies the existence of ducks. Maybe he doesn't like the sound of ducks. Maybe he just weighs the same as a duck. In any case, duck tolerance is necessary to use Python effectively. On a side note, it turns out there's no word for the fear of ducks. The closest phobia is anatidaephobia, which is the fear of being /watched/ by a duck. -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError: unbound method DefaultTracer() must be called with MyClass instance as first argument (got str instance instead)
Peter Otten wrote: or you wrap the callable in a descriptor: def DefaultTracer(*args): print args ... class D(object): ... def __init__(self, f): ... self.f = f ... def __get__(self, *args): ... return self.f ... After skimming over Steven's post: use staticmethod. No idea why I didn't think of that myself. -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On 2011.07.06 06:16 PM, Steven D'Aprano wrote: Phlip wrote: Note the fix also avoids comparing to None, which, as usual, is also icky and less typesafe! Typesafe? Are you trying to make a joke? No, I was pointing out that passing a type is more ... typesafe. -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On 2011.07.07 08:11 AM, Phlip wrote: No, I was pointing out that passing a type is more ... typesafe. None is a type. None.__class__ class 'NoneType' -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On Jul 7, 6:24 am, Andrew Berg bahamutzero8...@gmail.com wrote: On 2011.07.07 08:11 AM, Phlip wrote: No, I was pointing out that passing a type is more ... typesafe. None is a type. I never said it wasn't. -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On 2011.07.07 08:39 AM, Phlip wrote: On Jul 7, 6:24 am, Andrew Berg bahamutzero8...@gmail.com wrote: On 2011.07.07 08:11 AM, Phlip wrote: No, I was pointing out that passing a type is more ... typesafe. None is a type. I never said it wasn't. You are talking about this code, right? def file_to_hash(path, m=None): if m is None: m = hashlib.md5() What's not a type? The is operator compares types (m's value isn't the only thing compared here; even an separate instance of the exact same type would make it return False), and m can't be undefined. -- http://mail.python.org/mailman/listinfo/python-list
Re: Testing if a global is defined in a module
On 2011-07-06, Waldek M. wm@localhost.localdomain wrote: Dnia Wed, 06 Jul 2011 03:36:24 +1000, Steven D'Aprano napisa?(a): Because unless you are extremely disciplined, code and the comments describing them get out of sync. [...] True, but that gets far worse with external docs. Do you have in mind any better replacement? You write code that's easy to read, and you provide the language with introspection capabilities that allow you do do things like write a program that will list the symbols exported by a module. -- Grant Edwards grant.b.edwardsYow! Now that I have my at APPLE, I comprehend COST gmail.comACCOUNTING!! -- http://mail.python.org/mailman/listinfo/python-list
Tips/lessons learned for writing a Python powered DSL?
Looking for tips and lessons learned (advice on what to do and not do) for writing a Python based DSL. Googling python dsl yields some wonderful content which I've just started to read. If there are specific articles or 3rd party libraries that you used to implement a DSL, I would appreciate hearing about them. Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Tips/lessons learned for writing a Python powered DSL?
For me, diving into the data model really helped me grasp some of the metaprogramming capabilities that python has, which is helping me as I am implementing my own DSL in python. http://docs.python.org/reference/datamodel.html On Thu, Jul 7, 2011 at 10:20 AM, pyt...@bdurham.com wrote: Looking for tips and lessons learned (advice on what to do and not do) for writing a Python based DSL. Googling python dsl yields some wonderful content which I've just started to read. If there are specific articles or 3rd party libraries that you used to implement a DSL, I would appreciate hearing about them. Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list -- --- Paul Woolcock -- http://mail.python.org/mailman/listinfo/python-list
Question- Getting Windows 64bits information Python 32bits
Greetings I'm running Python (32b) in Windows7 (at 64bits) and I would like to know how can I check if my machine is a 32b or 64b in Python. Is it possible? I saw a few examples (like platform) but they only provide information about Python not the machine. Thanks Toze -- http://mail.python.org/mailman/listinfo/python-list
Re: Question- Getting Windows 64bits information Python 32bits
On 2011.07.07 10:21 AM, António Rocha wrote: I'm running Python (32b) in Windows7 (at 64bits) and I would like to know how can I check if my machine is a 32b or 64b in Python. Is it possible? I saw a few examples (like platform) but they only provide information about Python not the machine. os.environ['processor_architecture'] os.environ is a dictionary of system environment variables. That exact key probably only exists on Windows, but I'm there is a similar key on other platforms. -- http://mail.python.org/mailman/listinfo/python-list
Re: Large number multiplication
On Thu, Jul 7, 2011 at 2:30 AM, Ulrich Eckhardt ulrich.eckha...@dominolaser.com wrote: Even worse, most people would actually pay for its use, because they don't use numbers large enough to merit the Schönhage–Strassen algorithm. As it stands, Karatsuba is only used for numbers greater than a specific threshold. Adding Schönhage–Strassen would just mean adding another threshold, below which Karatsuba would still be used. So at worst it would just add another comparison or two for numbers within the Karatsuba range. -- http://mail.python.org/mailman/listinfo/python-list
Re: Large number multiplication
On Thu, Jul 7, 2011 at 9:49 AM, Ian Kelly ian.g.ke...@gmail.com wrote: On Thu, Jul 7, 2011 at 2:30 AM, Ulrich Eckhardt ulrich.eckha...@dominolaser.com wrote: Even worse, most people would actually pay for its use, because they don't use numbers large enough to merit the Schönhage–Strassen algorithm. As it stands, Karatsuba is only used for numbers greater than a specific threshold. Adding Schönhage–Strassen would just mean adding another threshold, below which Karatsuba would still be used. So at worst it would just add another comparison or two for numbers within the Karatsuba range. And I just realized that you said as much yourself further down in your message. My apologies for the needless lecturing. -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EXCELLENT
On Thu, Jul 7, 2011 at 1:12 AM, Ulrich Eckhardt ulrich.eckha...@dominolaser.com wrote: Just guessing, is it legacy, C-with-classes code rather than C++ code perhaps? Haven't looked at wx for a while. Such code typically lacks understanding of exceptions, which are the only way to signal failure from e.g. constructors. No, wx is C++ through and through. No namespaces. No templates but macros. No exceptions. No C++. Sorry, I beg to differ. BTW, they say themselves that they tolerate but not use exceptions, so they actually need two-stage construction if construction can fail, and for exactly the guessed legacy reasons. Ah, I think I misunderstood your meaning. By C-with-classes I thought you were referring to the practice of OOP in C, and my response was to the effect that building wx requires a C++ compiler, not just a C compiler. -- http://mail.python.org/mailman/listinfo/python-list
Re: Large number multiplication
Hi, Billy Mays wrote: On 07/06/2011 04:02 PM, Ian Kelly wrote: On Wed, Jul 6, 2011 at 1:30 PM, Billy Maysno...@nohow.com wrote: I was looking through the python source and noticed that long multiplication is done using the Karatsuba method (O(~n^1.5)) rather than using FFTs O(~n log n). I was wondering if there was a reason the Karatsuba method was chosen over the FFT convolution method? The reason I ask is because convolution has a better (best ?) complexity Better complexity, yes. This means smaller execution time for LARGE ENOUGH operands Billy Mays wrote: I was more interested in finding previous discussion (if any) on why Karatsuba was chosen, not so much as trying to alter the current multiplication implementation. I'm not a python developer, but I worked on multiplication algorithms for GMP [ http://gmplib.org/ ], and I can guess the answer: - Karatsuba is (by far) simpler to implement, - FFT-based multiplication is (by far) slower than Karatsuba for numbers that are not huge. I try to attach a small graph http://old.nabble.com/file/p32014454/karaVSfft.pdf karaVSfft.pdf , with timings for multiplications of n-bits operands (with GMP, on my very old laptop) with Toom(2,2) (it's Karatsuba!) and the FFT-based computation. The first is faster than the latter up to 1 bits (GMP uses some Toom for that size, to get the result even faster). Regards, Marco -- http://bodrato.it/software/toom.html -- View this message in context: http://old.nabble.com/Large-number-multiplication-tp32007815p32014454.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: Question- Getting Windows 64bits information Python 32bits
On Thu, 07 Jul 2011, Andrew Berg wrote:
On 2011.07.07 10:21 AM, António Rocha wrote:
I'm running Python (32b) in Windows7 (at 64bits) and I would like to
know how can I check if my machine is a 32b or 64b in Python. Is it
possible? I saw a few examples (like platform) but they only provide
information about Python not the machine.
os.environ['processor_architecture']
os.environ is a dictionary of system environment variables. That exact
key probably only exists on Windows, but I'm there is a similar key on
other platforms.
$ python -c 'import platform; print platform.architecture()'
('64bit', 'ELF')
http://docs.python.org/library/platform.html
Phil.
--
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Re: Question- Getting Windows 64bits information Python 32bits
On 7/7/11 11:33 AM, Philip Reynolds wrote:
On Thu, 07 Jul 2011, Andrew Berg wrote:
On 2011.07.07 10:21 AM, António Rocha wrote:
I'm running Python (32b) in Windows7 (at 64bits) and I would like to
know how can I check if my machine is a 32b or 64b in Python. Is it
possible? I saw a few examples (like platform) but they only provide
information about Python not the machine.
os.environ['processor_architecture']
os.environ is a dictionary of system environment variables. That exact
key probably only exists on Windows, but I'm there is a similar key on
other platforms.
$ python -c 'import platform; print platform.architecture()'
('64bit', 'ELF')
http://docs.python.org/library/platform.html
This is not what the OP is looking for. The OP wants to know what the CPU and OS
are capable of, not what the Python executable is compiled for.
platform.architecture() gives the latter.
--
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
--
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Re: blist question
On Thu, Jul 7, 2011 at 5:08 AM, dmitrey dmitre...@gmail.com wrote: I feel lack of native Python lists operations (e.g. taking N greatest elements with the involved key function and O(n) speed) and occasionally found blist http://pypi.python.org/pypi/blist/ Its entry says it is better than Python list. Did anyone ensure? It has better performance for many operations. I made a very detailed performance comparison here (against Python 3.1): http://stutzbachenterprises.com/performance-blist Undoubtedly, you can find sequences of operations where Python's built-in list type has better performance by a constant factor. Python's built-in list type is more memory-efficient for small lists (blist's memory usage for small lists could be improved to be similar, but I haven't gotten around to making the necessary changes.) Will it ever be merged into Python source code? Seems unlikely. -- Daniel Stutzbach -- http://mail.python.org/mailman/listinfo/python-list
Re: Question- Getting Windows 64bits information Python 32bits
2011/7/7 António Rocha toyze.ro...@gmail.com
Greetings
I'm running Python (32b) in Windows7 (at 64bits) and I would like to know
how can I check if my machine is a 32b or 64b in Python. Is it possible? I
saw a few examples (like platform) but they only provide information about
Python not the machine.
Thanks
Toze
Running CPython compiled for 32-bit on a Windows 7 64-bit machine gives the
following:
platform.architecture()
('32bit', 'WindowsPE')
platform.machine()
'AMD64'
This didn't used to be the case - it was corrected in
http://bugs.python.org/issue7860 so you may need to upgrade to get accurate
information if you have an older Python installed.
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Programming tips :-)
I just found the following url in my archives at work and thought you might enjoy it: http://thc.org/root/phun/unmaintain.html /Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: module problem on windows 64bit
On Jul 5, 5:05 pm, Thomas Jollans t...@jollybox.de wrote: On 06/27/2011 06:59 PM, miamia wrote: Hello, on 32-bit windows everything works ok but on 64-bit win I am getting this error: Traceback (most recent call last): File app.py, line 1040, in do_this_now File kinterbasdb\__init__.pyc, line 119, in module File kinterbasdb\_kinterbasdb.pyc, line 12, in module File kinterbasdb\_kinterbasdb.pyc, line 10, in __load ImportError: DLL load failed: This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem. How to get it work on 64bit windows as well? many thanks A process can only link to a shared library compiled for the same architecture as the process. In layman's terms: A 32-bit DLL won't work with a 64-bit program. It looks like this package is attempting to load a 32-bit DLL. That's not going to work. Either procure a 64-bit version of the DLL, or use a 32-bit version of Python. hello, it looks lite I solved it with files msvcp80.dll, Microsoft.VC80.CRT.manifest. I forgot to extract these files from firebird embedded pachage to my app folder. now it seems to be ok on both systems 32 and 64bit (so It wasn't 64bit issue as I thought). thank you -- http://mail.python.org/mailman/listinfo/python-list
Re: blist question
Have you looked at http://docs.python.org/library/collections.html#collections.deque ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EVIL!
On Jul 7, 12:34 am, Gregory Ewing greg.ew...@canterbury.ac.nz wrote: rantingrick wrote: Yes but what benefit does that gain over say, Tkinter's design (because that has been your argument). Like I said, it's a tangential issue. Agreed. The important thing is that it's okay for an app to stay alive until its *last* top level window is closed. So your argument is: A window hierarchy is bad because if your application requires a user to open a gazillion windows (read as: designed poorly) --each representing completely different transactions-- and if you close the original window all the other windows will close too. Boo :( continuing... There doesn't have to be a special main window that kills the whole app when you close it. So you prefer to close a gazillion windows one by one? If so, why not just code the GUI correctly from the start; by creating separate transactions? Thereby reducing the number of windows a user must juggle? FYI: You know the user complexity of a GUI increases exponentially by the number of windows present. However, I think what the original complaint was really about is that when you create a non-toplevel widget in Tkinter you have to specify its parent (and if you don't, it assumes you want it to be a child of the main window). Thats was MY complaint yes. On the grounds that widgets require windows NOT windows require widgets. This fact will confuse folks. You can't create the widget first and specify its parent later. This is another API flaw that is seen distressingly often in GUI libraries. It's a nuisance, because it means you can't write code that creates a widget hierarchy bottom-up. Actually you can! Stay tuned for enlightenment! For example, in PyGUI you can write things like dialog_contents = Column([ Label(Caution: Your underpants are on fire.), Row([Button(OK), Button(Cancel)]) ]) There's no way you could write Row and Column functions for Tkinter that work like that -- they would have to take parent widgets as arguments, and you wouldn't be able to nest the calls. WRONG! A function or class structure can handle this just fine. And lends itself nicely to GUI programming. ## START CODE ## import Tkinter as tk class DumbDialog(tk.Toplevel): def __init__(self, master, **kw): w=tk.Label(master, text=Caution: Your underpants are on fire.) w.pack() w=tk.Button(master, text=OK).pack() w=tk.Button(master, text=Cancel).pack() print 'start script' root = tk.Tk() d = DumbDialog(root) root.mainloop() print 'continue script' root = tk.Tk() d = DumbDialog(root) root.mainloop() print 'end script' ## END CODE ## *school bell rings* -- http://mail.python.org/mailman/listinfo/python-list
Re: Large number multiplication
On Jul 7, 1:30 am, Ulrich Eckhardt ulrich.eckha...@dominolaser.com wrote: Billy Mays wrote: On 07/06/2011 04:02 PM, Ian Kelly wrote: According to Wikipedia: In practice the Schönhage–Strassen algorithm starts to outperform older methods such as Karatsuba and Toom–Cook multiplication for numbers beyond 2**2**15 to 2**2**17 (10,000 to 40,000 decimal digits). I think most Python users are probably not working with numbers that large, and if they are, they are probably using specialized numerical libraries anyway, so there would be little benefit in implementing it in core. You are right that not many people would gain significant use of it. Even worse, most people would actually pay for its use, because they don't use numbers large enough to merit the Schönhage–Strassen algorithm. The reason I ask is because convolution has a better (best ?) complexity class than the current multiplication algorithm. The asymptotic complexity of algorithms (I guess that's what you mean) is concerned with large up to infinite n elements in operations. The claim there always excludes any number of elements below n_0, where the complexity might be different, even though that is usually not repeatedly mentioned. In other words, lower complexity does not mean that something runs faster, only that for large enough n it runs faster. If you never realistically reach that limit, you can't reap those benefits. That said, I'm sure that the developers would accept a patch that switches to a different algorithm if the numbers get large enough. I believe it already doesn't use Karatsuba for small numbers that fit into registers, too. I was more interested in finding previous discussion (if any) on why Karatsuba was chosen, not so much as trying to alter the current multiplication implementation. I would hope that such design decisions are documented in code or at least referenced from there. Otherwise the code is impossible to understand and argue about. Cheers! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932- Hide quoted text - - Show quoted text - A quick search on the Python issue tracker (bugs.python.org) yields the following issues: http://bugs.python.org/issue560379 http://bugs.python.org/issue4258 The issues also refer to discussion threads on the python-dev mailing list. casevh -- http://mail.python.org/mailman/listinfo/python-list
making socket.getaddrinfo use cached dns
I use cached dns lookups with pdnsd on my ubuntu machine to speed up web access as regular lookups can take 15-30 seconds. However, python's mechanize and urllib etc use socket.getaddrinfo, which seems not to be using dns cacheing or taking a long time because of ipv6 lookups. In either case, I subsequent access to the same site to be fast and not require lengthy calls to getaddrinfo. How can I get python to correctly use cached dns lookups and ipv4 only (at least in those cases where it is appropriate). As mentioned here: http://stackoverflow.com/questions/2014534/force-python-mechanize-urllib2-to-only-use-a-requests/2035686#2035686 It seems that many python libraries are hardcoded to look for both ipv6 and ipv4. Since ipv6 lookups are extremely slow at least for some users, perhaps the devs should carry over these optional arguments to higher level libraries like mechanize, urllib, httplib etc. -- http://mail.python.org/mailman/listinfo/python-list
i get different answers based on run platform
I have this simple palindrome program that yields different results
depending on whether I run it from Windows or from IDLE. The answer
is correct off IDLE, but why is this the case? Here's the code:
def reverse(text):
return text[::-1]
def is_palindrome(text):
return text==reverse(text)
while True:
something=input('enter text:')
print(something)
print(something[::-1])
if (is_palindrome(something)):
print(yes, it is a palindrome)
break
else:
print(no, it is not a palindrome)
continue
print ('done')
Thanks for your help.
--
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Re: Implicit initialization is EVIL!
On Fri, Jul 8, 2011 at 3:29 AM, rantingrick rantingr...@gmail.com wrote:
So your argument is:
A window hierarchy is bad because if your application requires
a user to open a gazillion windows (read as: designed poorly) --each
representing completely different transactions-- and if you close the
original window all the other windows will close too. Boo :(
Why should opening multiple windows AUTOMATICALLY equate to poor design?
So you prefer to close a gazillion windows one by one? If so, why not
just code the GUI correctly from the start; by creating separate
transactions? Thereby reducing the number of windows a user must
juggle? FYI: You know the user complexity of a GUI increases
exponentially by the number of windows present.
By separate transactions do you mean that the user can
simultaneously perform multiple actions? Because that's best done with
multiple separate interfaces - such as, multiple windows. Or do you
really mean sequential transactions? That would not in any way be
good design.
For
example, in PyGUI you can write things like
dialog_contents = Column([
Label(Caution: Your underpants are on fire.),
Row([Button(OK), Button(Cancel)])
])
WRONG! A function or class structure can handle this just fine. And
lends itself nicely to GUI programming.
You have to break your code into two pieces. Here's an alternative way
of laying out a dialog, this taken from Pike-GTK2:
mainwindow-add(GTK2.Vbox(0,0)-add(GTK2.HbuttonBox()-add(button(E_xit,window_destroy)-set_use_underline(1))-add(button(Set,setprops))-set_layout(GTK2.BUTTONBOX_SPREAD)))-show_all();
This program uses utility functions such as:
//Helper function to create a button and give it an event. Useful
because signal_connect doesn't return self.
GTK2.Button button(mixed content,function clickevent,mixed|void arg)
{
GTK2.Button ret=GTK2.Button(content);
ret-signal_connect(clicked,clickevent,arg);
return ret;
}
I make no apologies for the braces in the code :)
The 'button' function creates a button and assigns it an event. At
this stage, the button has no parent; it won't be drawn anywhere. The
GTK2.Button object is returned, and then added. It's added to the
HbuttonBox which is then added to the Vbox which is only then added to
the main window; although the code would work just fine if done in the
other order. It's important here that objects are simply objects -
they don't have to be built in a tree structure; and the window's
layout is entirely in the one place, I don't have to put half of it
into the window's constructor.
ChrisA
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Re: making socket.getaddrinfo use cached dns
On Fri, Jul 8, 2011 at 4:18 AM, high bandwidth widebandwi...@gmail.com wrote: I use cached dns lookups with pdnsd on my ubuntu machine to speed up web access as regular lookups can take 15-30 seconds. However, python's mechanize and urllib etc use socket.getaddrinfo, which seems not to be using dns cacheing or taking a long time because of ipv6 lookups. In either case, I subsequent access to the same site to be fast and not require lengthy calls to getaddrinfo. How can I get python to correctly use cached dns lookups and ipv4 only (at least in those cases where it is appropriate). One solution would be to do your own DNS lookups and then pass urllib an IP address. Is pdnsd set up to be your computer's primary resolver? (Is /etc/resolv.conf pointing to localhost?) If not, that might help. I've generally done my DNS caching using BIND, so I can't help with pdnsd specifically. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Programming tips :-)
On 2011.07.07 12:22 PM, Martin Schöön wrote: I just found the following url in my archives at work and thought you might enjoy it: http://thc.org/root/phun/unmaintain.html That's awesome. If a maintenance programmer can't quote entire Monty Python movies from memory, he or she has *no* business being a programmer. :-D -- http://mail.python.org/mailman/listinfo/python-list
Re: i get different answers based on run platform
In 842fce9d-1b3f-434a-b748-a6dc4828c...@h12g2000pro.googlegroups.com linda posts...@gmail.com writes: I have this simple palindrome program that yields different results depending on whether I run it from Windows or from IDLE. The answer is correct off IDLE, but why is this the case? Here's the code: Your code contains debugging statements that print the value of the normal string and the reversed string. What do those statements print when you run your program under Windows? That should go a long way towards telling you what the problem is. (Perhaps Windows leaves a linefeed character hanging at the end of the input line, which upsets the palindromic balance?) By the way, I could not make your program work as you provided it; I had to replace input() with raw_input(). Does it really work for you this way? -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: i get different answers based on run platform
linda wrote:
I have this simple palindrome program that yields different results
depending on whether I run it from Windows or from IDLE. The answer
is correct off IDLE, but why is this the case? Here's the code:
def reverse(text):
return text[::-1]
def is_palindrome(text):
return text==reverse(text)
while True:
something=input('enter text:')
try changing this to:
something = input('enter text:').rstrip('\n')
print(something)
print(something[::-1])
if (is_palindrome(something)):
print(yes, it is a palindrome)
break
else:
print(no, it is not a palindrome)
continue
print ('done')
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Re: i get different answers based on run platform
On 07/07/2011 19:18, linda wrote:
I have this simple palindrome program that yields different results
depending on whether I run it from Windows or from IDLE. The answer
is correct off IDLE, but why is this the case? Here's the code:
def reverse(text):
return text[::-1]
def is_palindrome(text):
return text==reverse(text)
while True:
something=input('enter text:')
print(something)
print(something[::-1])
if (is_palindrome(something)):
print(yes, it is a palindrome)
break
else:
print(no, it is not a palindrome)
continue
print ('done')
Thanks for your help.
Try printing ascii(something) too.
There's a known bug in Python 3.2 where it leaves a training '\r', if
that's what you're using (http://bugs.python.org/issue12435), fixed in
Python 3.2.1.
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Re: i get different answers based on run platform
John Gordon wrote: By the way, I could not make your program work as you provided it; I had to replace input() with raw_input(). Does it really work for you this way? input() is the 3.x name for raw_input() ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
Re: i get different answers based on run platform
On 07/07/2011 19:37, John Gordon wrote: In842fce9d-1b3f-434a-b748-a6dc4828c...@h12g2000pro.googlegroups.com lindaposts...@gmail.com writes: I have this simple palindrome program that yields different results depending on whether I run it from Windows or from IDLE. The answer is correct off IDLE, but why is this the case? Here's the code: Your code contains debugging statements that print the value of the normal string and the reversed string. What do those statements print when you run your program under Windows? That should go a long way towards telling you what the problem is. (Perhaps Windows leaves a linefeed character hanging at the end of the input line, which upsets the palindromic balance?) By the way, I could not make your program work as you provided it; I had to replace input() with raw_input(). Does it really work for you this way? It's Python 3. Python 2's raw_input() has been renamed input() in Python 3 and Python 2's input() was never in Python 3 because it uses eval on the string, which usually undesirable. -- http://mail.python.org/mailman/listinfo/python-list
Serial reset of the device
Hello, I'm trying to access a hardware board of my company through a serial connection using a Python script and the pyserial module. I use Python 2.7.1 with Ubuntu 11.04 (pyserial is the package python- serial with version 2.5.2, http://pyserial.sourceforge.net/pyserial_api.html). The board to which I'm trying to connect works correctly with serial as some other guys did some TCL scripts to manage it. My problem is that every time I open a new connection, the device is reset. I'd like to not have the device reset. The code is the following : handler = serial.Serial(port=self.portname, baudrate=9600, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE, stHello, I'm trying to access a hardware board of my company through a serial connection using a Python script and the pyserial module. I use Python 2.7.1 with Ubuntu 11.04 (pyserial is the package python- serial with version 2.5.2, http://pyserial.sourceforge.net/pyserial_api.html). The board to which I'm trying to connect works correctly with serial as some other guys did some TCL scripts to manage it. My problem is that every time I open a new connection, the device is reset. I'd like to not have the device reset. The code is the following : handler = serial.Serial(port=self.portname, baudrate=9600, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=None, dsrdtr=False) # here the device is reset ... handler.close() I found the following post http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1274205532 but I haven't tested it yet as I don't like the idea to change files managed by the system (and it is for Windows). Is there any possibility to not reset the device when opening the connection ? Thanks, Yorickopbits=serial.STOPBITS_ONE, timeout=None, dsrdtr=False) # here the device is reset ... handler.close() I found the following post http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1274205532 but I haven't tested it yet as I don't like the idea to change files managed by the system (and it is for Windows). Is there any possibility to not reset the device when opening the connection ? Thanks, Yorick -- http://mail.python.org/mailman/listinfo/python-list
multiprocessing.Manager().Namespace() and data copying
Hi! I'm trying to share data between processes using multiprocessing.Manager and creating shared Namespace. I have the following code: from multiprocessing import Manager from scipy import rand x = rand(5000, 5000) m = Manager() n = m.Namespace() n.x = x It seems that at n.x = x data is serialized and copied. It seems it is also serialized and copied at x = n.x. Is there a way to omit this to have really shared objects with Namespace? I need read only objects (not necessarily arrays)... -- http://mail.python.org/mailman/listinfo/python-list
Re: i get different answers based on run platform
I tried something = input('enter text:').rstrip('\n') as suggested but
the problem persists. BTW, the intermediate print commands agree and
so are not an issue. The disagreement is in IDLE correctly
identifying palindromes and Windows not. I do suspect it may be a
trailing '\r' issue. Is there an easy fix or shall I wait for the new
Python versions to be released? Thanks for helping.
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Re: i get different answers based on run platform
linda wrote:
I tried something = input('enter text:').rstrip('\n') as suggested but
the problem persists. BTW, the intermediate print commands agree and
so are not an issue. The disagreement is in IDLE correctly
identifying palindromes and Windows not. I do suspect it may be a
trailing '\r' issue. Is there an easy fix or shall I wait for the new
Python versions to be released? Thanks for helping.
My apologies -- change the '\n' to '\r' and that will hopefully do the
trick.
~Ethan~
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Re: i get different answers based on run platform
On Jul 7, 2:42 pm, Ethan Furman et...@stoneleaf.us wrote:
linda wrote:
I tried something = input('enter text:').rstrip('\n') as suggested but
the problem persists. BTW, the intermediate print commands agree and
so are not an issue. The disagreement is in IDLE correctly
identifying palindromes and Windows not. I do suspect it may be a
trailing '\r' issue. Is there an easy fix or shall I wait for the new
Python versions to be released? Thanks for helping.
My apologies -- change the '\n' to '\r' and that will hopefully do the
trick.
~Ethan~
Thanks Ethan--that did work :)
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Re: blist question
On Jul 7, 5:08 am, dmitrey dmitre...@gmail.com wrote: hi all, I feel lack of native Python lists operations (e.g. taking N greatest elements with the involved key function and O(n) speed) Take a look at heapq.nlargest()... and occasionally found blisthttp://pypi.python.org/pypi/blist/ Its entry says it is better than Python list. It should say: better in some respects and worse in others Do you honestly think that python's list implementation as a simple array of pointers can be beaten in every category of performance? Did anyone ensure? Will it ever be merged into Python source code? It was rejected as a replacement for the existing list implementation. There is some chance it will get accepted into the collections module someday. Raymond -- http://mail.python.org/mailman/listinfo/python-list
Re: Testing if a global is defined in a module
On Thu, Jul 7, 2011 at 7:18 AM, Grant Edwards invalid@invalid.invalid wrote: On 2011-07-06, Waldek M. wm@localhost.localdomain wrote: Dnia Wed, 06 Jul 2011 03:36:24 +1000, Steven D'Aprano napisa?(a): Because unless you are extremely disciplined, code and the comments describing them get out of sync. [...] True, but that gets far worse with external docs. Do you have in mind any better replacement? You write code that's easy to read Reminded me of this excellent presentation: Uncomment Your Code https://docs.google.com/present/view?id=ah82mvnssv5d_162dbgx78gw Cheers, Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EVIL!
rantingrick wrote: On Jul 7, 12:34 am, Gregory Ewing greg.ew...@canterbury.ac.nz wrote: The important thing is that it's okay for an app to stay alive until its *last* top level window is closed. I partially disagree with Greg on this. This is not the only model: on the Apple Mac, or any system with a similar GUI design, the application can survive having the last window closed. There are other application types that don't need any window at all. So while it is common for closing the last window to exit the application, it is not a necessary requirement. There doesn't have to be a special main window that kills the whole app when you close it. So you prefer to close a gazillion windows one by one? Nonsense. Greg says nothing of the sort. Avoiding the anti-pattern close a gazillion windows one by one is why you have an application-wide Quit or Exit command, as opposed to a Close command which applies only to the current window. If so, why not just code the GUI correctly from the start; by creating separate transactions? Thereby reducing the number of windows a user must juggle? FYI: You know the user complexity of a GUI increases exponentially by the number of windows present. Don't assume that there is a one-to-one relationship between transactions (documents?) and windows. The relationship is actually many-to-many: windows can contain tabbed or notepad interfaces, or can be split into multiple panes, or both. Panes and tabs can be split into independent windows, or rejoined into one main window. E.g. I can have six Firefox windows open, each one with many different websites open in separate tabs. I have Close Tab, Close Window and Exit Firefox commands. In Konquorer, not only can I have multiple windows and multiple tabs, but I can split each tab into two or more panes, and display two views of the same document in the same tab, or two different documents in the one tab. This is especially useful when using it as a file manager. In older versions of Word (and possibly current, although I haven't tested it) you can open files multiple times. Each time opens in a new window, representing a new view of the one file. Edits in one window update all the others. This can be useful for, e.g. making edits to page 3 while simultaneously viewing page 303. An alternate UI for to split the one window into two panes, and scroll them independently. So a single file may have one or two panes, in one or more windows. So, you can have multiple documents in multiple windows, and there is no 1:1 relationship between them. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
Andrew Berg wrote: On 2011.07.07 08:39 AM, Phlip wrote: On Jul 7, 6:24 am, Andrew Berg bahamutzero8...@gmail.com wrote: On 2011.07.07 08:11 AM, Phlip wrote: No, I was pointing out that passing a type is more ... typesafe. None is a type. I never said it wasn't. Unfortunately, it isn't. None is not a type, it is an instance. isinstance(None, type) # is None a type? False isinstance(None, type(None)) # is None an instance of None's type? True So None is not itself a type, although it *has* a type: type(None) type 'NoneType' isinstance(type(None), type) # is NoneType itself a type? True You are talking about this code, right? def file_to_hash(path, m=None): if m is None: m = hashlib.md5() What's not a type? The is operator compares types (m's value isn't the only thing compared here; even an separate instance of the exact same type would make it return False), and m can't be undefined. The is operator does not compare types, it compares instances for identity. There is no need for is to ever care about the type of the arguments -- that's just a waste of time, since a fast identity (memory location) test is sufficient. This is why I initially thought that Phlip was joking when he suggested that m is None could be type-unsafe. It doesn't matter what type m has, m is anything will always be perfectly safe. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EVIL!
rantingrick wrote: So you prefer to close a gazillion windows one by one? If I want to close all the windows, I can use the application's Quit or Exit command, or whatever the platform calls it. (Note that if there is a separate instance of the application for each window -- as was suggested earlier -- then you don't have that option, and you have to close them one by one anyway.) There's no way you could write Row and Column functions for Tkinter that work like that -- they would have to take parent widgets as arguments, and you wouldn't be able to nest the calls. WRONG! A function or class structure can handle this just fine. class DumbDialog(tk.Toplevel): def __init__(self, master, **kw): w=tk.Label(master, text=Caution: Your underpants are on fire.) w.pack() w=tk.Button(master, text=OK).pack() w=tk.Button(master, text=Cancel).pack() Which is *exactly* what I said you would have to do in Tkinter! Each widget creation requires a separate statement, with the parent passed in at each step. This is nowhere near as convenient as the nested function call style. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
On 2011.07.07 08:46 PM, Steven D'Aprano wrote: None is not a type, it is an instance. isinstance(None, type) # is None a type? False isinstance(None, type(None)) # is None an instance of None's type? True So None is not itself a type, although it *has* a type: type(None) type 'NoneType' isinstance(type(None), type) # is NoneType itself a type? True I worded that poorly. None is (AFAIK) the only instance of NoneType, but I should've clarified the difference. The is operator does not compare types, it compares instances for identity. There is no need for is to ever care about the type of the arguments -- that's just a waste of time, since a fast identity (memory location) test is sufficient. Compare was the wrong word. I figured the interpreter doesn't explicitly compare types, but obviously identical instances are going to be of the same type. -- http://mail.python.org/mailman/listinfo/python-list
Re: Programming tips :-)
On Jul 7, 11:36 am, Andrew Berg bahamutzero8...@gmail.com wrote: On 2011.07.07 12:22 PM, Martin Schöön wrote: I just found the following url in my archives at work and thought you might enjoy it: http://thc.org/root/phun/unmaintain.html That's awesome. That's How To Write Unmaintainable Code - a venerable classic. Compare these: http://c2.com/cgi/wiki?HowToPissOffYourPair http://c2.com/cgi/wiki?HelpSourceForgeSuck -- http://mail.python.org/mailman/listinfo/python-list
Re: Does hashlib support a file mode?
I worded that poorly. None is (AFAIK) the only instance of NoneType, but I should've clarified the difference. The is operator does not compare types, it compares instances for identity. None is typesafe, because it's strongly typed. However, what's even MORE X-safe (for various values of X) is a method that takes LESS for its arguments. That's why I switched from passing an object to passing a type, because the more restrictive argument type is more typesafe. However, the MOST X-safe version so far simply passes a string, and uses hashlib the way it designs to be used: def file_to_hash(path, hash_type): hash = hashlib.new(hash_type) with open(path, 'rb') as f: while True: s = f.read(8192) if not s: break hash.update(s) return hash.hexdigest() -- http://mail.python.org/mailman/listinfo/python-list
Re: Serial reset of the device
On Thu, Jul 7, 2011 at 12:34 PM, yorick yorick.bru...@gmail.com wrote: Hello, I'm trying to access a hardware board of my company through a serial connection using a Python script and the pyserial module. I use Python 2.7.1 with Ubuntu 11.04 (pyserial is the package python- serial with version 2.5.2, http://pyserial.sourceforge.net/pyserial_api.html). The board to which I'm trying to connect works correctly with serial as some other guys did some TCL scripts to manage it. My problem is that every time I open a new connection, the device is reset. I'd like to not have the device reset.http://mail.python.org/mailman/listinfo/python-list A few suggestions: 1) You could try strace'ing the TCL, and then strace'ing the Python, and comparing - especially if you're comfortable with low-level I/O in C, but not only. Hunt for the open() call to the relevant device file, and other system calls near it. Even if you aren't that cozy with C, you could try putting the strace results on a website or ftp server, and posting links to them here. 2) Check and double check and triple check your line discipline parameters: bits per second, parity, word size, start/stop bits. 3) It's also possible the cable is bad (or merely inappropriate), especially if the TCL is accessing such a device over a different cable. There is no one true serial (RS-232) cable standard - RS-232 is a rather large collection of ways of doing communications, and they are frequently not compatible with one another. 4) One of the more likely causes of a reset of a device that is accessed serially, is sending it a break signal. There are official ways of sending a break, and accidental ways. Sometimes the two boil down to the same thing behind the scenes, but look very different in the code. A break signal is a longish sequence of unframed 0 bits (IE, with no start/stop bits separating one byte from another). An accidental way of sending a break, is to set your bits per second too low, and then sending a 0 byte - because those 8 0 bits at the too-low speed will look like a long series of unframed 0's from the perspective of the reader process that's running at the correct speed. So I guess the gist of point #4 (this point), is make sure your bps is set correctly and check the device doc to see if a break signal causes a reset 5) If the protocol layered over the serial communication is ASCII-based, you could try connecting to the device using something like minicom, to make sure the device is behaving as expected. If the device is speaking a binary protocol, this is unlikely to help much HTH -- http://mail.python.org/mailman/listinfo/python-list
Hello Sweet Friends.
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[issue10278] add time.wallclock() method
Matt Joiner anacro...@gmail.com added the comment: What's the status of this bug? This is a very useful feature, I've had to use and add bindings to monotonic times for numerous applications. Can it make it into 3.3? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10278 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8271] str.decode('utf8', 'replace') -- conformance with Unicode 5.2.0
Changes by Saul Spatz saul.sp...@gmail.com: -- nosy: +spatz123 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8271 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12511] class/instance xyz has no attribute '_abc'
New submission from Andreas Hasenkopf webmas...@hasenkopf2000.net: I'm using 64bit Arch Linux and Python 2.7.2 compiled with GCC 4.6.1. I have noticed in several ocassions that the interpreter is complaining about AttributeError: XMLGenerator instance has no attribute '_write' (in case of module xml.sax.saxutils.XMLGenerator) or AttributeError: RendererGDK instance has no attribute '_text2path' (in case of matplotlib when trying to use TeX formatting of text) When I have a look into the corresponding modules I can clearly see method definitions (e.g. def _write(self, text) in line 97 of xml/sax/saxutils.py I have no clue, why it is happening in some modules, but not in others. If a write my own module containing a class with a _write method it is working fine. If I write a class derived from xml.sax.saxutils.XMLGenerator and overwrite the _write method it is known to the system, but many of the attributes beginning with an underscore appear still to be unknown... This is very odd?! -- components: XML messages: 139966 nosy: Andreas.Hasenkopf priority: normal severity: normal status: open title: class/instance xyz has no attribute '_abc' versions: Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12511 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9242] unicodeobject.c: use of uninitialized values
Changes by STINNER Victor victor.stin...@haypocalc.com: -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9242 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5505] sys.stdin.read() doesn't return after first EOF on Windows
Changes by STINNER Victor victor.stin...@haypocalc.com: -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5505 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10117] Tools/scripts/reindent.py fails on non-UTF-8 encodings
STINNER Victor victor.stin...@haypocalc.com added the comment: Leaving open to discuss whether anything can/should be done for the case when reindent acts as an stdin sys.stdin.buffer and sys.stdout.buffer should be used with tokenize.detect_encoding(). We may read first stdin and write it into a BytesIO object to be able to rewind after detect_encoding. Something like: content = sys.stdin.buffer.read() raw = io.BytesIO(content) buffer = io.BufferedReader(raw) encoding, _ = detect_encoding(buffer.readline) buffer.seek(0) text = TextIOWrapper(buffer, encoding) # use text -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10117 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10284] NNTP should accept bytestrings for username and password
Changes by STINNER Victor victor.stin...@haypocalc.com: -- components: +Unicode nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10284 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10945] bdist_wininst depends on MBCS codec, unavailable on non-Windows
STINNER Victor victor.stin...@haypocalc.com added the comment: Can't you only work with Unicode and avoid the MBCS encoding? -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10945 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10872] Add mode to TextIOWrapper repr
Changes by STINNER Victor victor.stin...@haypocalc.com: -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10872 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12512] codecs: StreamWriter issue with stateful codecs after a seek
New submission from STINNER Victor victor.stin...@haypocalc.com:
The following code fails with an AssertionError('###\ufeffdef'):
import codecs
_open = codecs.open
#_open = open
filename = test
with _open(filename, 'w', encoding='utf_16') as f:
f.write('abc')
pos = f.tell()
with _open(filename, 'w', encoding='utf_16') as f:
f.seek(pos)
f.write('def')
f.seek(0)
f.write('###')
with _open(filename, 'r', encoding='utf_16') as f:
content = f.read()
assert content == '###def', ascii(content)
It is a bug in StreamWriter.seek(): it should update the encoder state to not
write a new BOM. It has to be fixed in the StreamWriter class of each stateful
codec, or a stateful StreamWriter class should be implemented in the codecs
module.
Python supports the following stateful codecs:
* cp932
* cp949
* cp950
* euc_jis_2004
* euc_jisx2003
* euc_jp
* euc_kr
* gb18030
* gbk
* hz
* iso2022_jp
* iso2022_jp_1
* iso2022_jp_2
* iso2022_jp_2004
* iso2022_jp_3
* iso2022_jp_ext
* iso2022_kr
* shift_jis
* shift_jis_2004
* shift_jisx0213
* utf_8_sig
* utf_16
* utf_32
This bug has already been fixed in TextIOWrapper: issue #5006.
--
messages: 139969
nosy: haypo
priority: normal
severity: normal
status: open
title: codecs: StreamWriter issue with stateful codecs after a seek
versions: Python 2.7, Python 3.2, Python 3.3
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[issue12512] codecs: StreamWriter issues with stateful codecs after a seek or with append mode
STINNER Victor victor.stin...@haypocalc.com added the comment:
There is a similar bug for append mode:
import codecs
_open = codecs.open
#_open = open
filename = test
with _open(filename, 'w', encoding='utf_16') as f:
f.write('abc')
with _open(filename, 'a', encoding='utf_16') as f:
f.write('def')
with _open(filename, 'r', encoding='utf_16') as f:
content = f.read()
assert content == 'abcdef', ascii(content)
This bug has also been fixed by the issue #5006 in the io module.
--
title: codecs: StreamWriter issue with stateful codecs after a seek - codecs:
StreamWriter issues with stateful codecs after a seek or with append mode
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[issue12391] packaging install fails to clean up temp files
Roundup Robot devnull@devnull added the comment: New changeset a4405b799e1b by Vinay Sajip in branch 'default': Closes #12391: temporary files are now cleaned up. http://hg.python.org/cpython/rev/a4405b799e1b -- nosy: +python-dev resolution: - fixed stage: commit review - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12391 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10647] scrollbar crash in non-US locale format settings
Hans Bering hans.ber...@arcor.de added the comment: Ok, _now_ I have run into the same problem. I have attached a small script similar to the original entry (but shorter) which will reliably crash with Python 3.1.4 on Windows 7 (64bit) when using a locale with a comma decimal fraction marker (e.g., German). The stacktrace is as follows: Exception in Tkinter callback Traceback (most recent call last): File C:\Python31\lib\tkinter\__init__.py, line 1400, in __call__ return self.func(*args) File C:\Python31\lib\tkinter\__init__.py, line 2799, in set self.tk.call((self._w, 'set') + args) _tkinter.TclError: expected floating-point number but got 0,2 The script runs fine with an English locale. It also runs fine with Python 3.2 on the same machine Windows German locale. The reason seems to be that the Scrollbar lets its self.tk compute fractions which self.tk returns as locale-dependent strings; the Scrollbar runs into problems when converting these strings into floats. -- Added file: http://bugs.python.org/file22603/scrollbarCrash1.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10647 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10647] scrollbar crash in non-US locale format settings
Changes by Hans Bering hans.ber...@arcor.de: Removed file: http://bugs.python.org/file22535/tkinterCrash.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10647 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Andreas Stührk andy-pyt...@hammerhartes.de added the comment: Attached is a patch that replaces `lib2to3.fixer_Base.BaseFix.set_filename()` during tests. With the patch applied, I don't get any refleaks for packaging. Another approach would be to simply remove the logging attribute of lib2to3 fixers, as it isn't used anyway. -- keywords: +patch nosy: +benjamin.peterson Added file: http://bugs.python.org/file22604/issue12167_patch_2to3.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10945] bdist_wininst depends on MBCS codec, unavailable on non-Windows
Ralf Schlatterbeck r...@runtux.com added the comment: On Thu, Jul 07, 2011 at 10:52:51AM +, STINNER Victor wrote: Can't you only work with Unicode and avoid the MBCS encoding? I'm trying to build a windows binary package on Linux. This usually works fine -- as long as the package description doesn't contain unicode. If it *contains* unicode it will somehow internally use MBCS encoding. So if someone fixes windows binary package building on non-windows platforms to not use MBCS encoding this is fine with me. But maybe the easier way out here is to include that codec on all platforms. (and don't tell me I have to install windows for building a windows binary package :-) Thanks, Ralf -- Dr. Ralf Schlatterbeck Tel: +43/2243/26465-16 Open Source Consulting www: http://www.runtux.com Reichergasse 131, A-3411 Weidling email: off...@runtux.com osAlliance member email: r...@osalliance.com -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10945 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12513] codec.StreamReaderWriter: issues with interlaced read-write
New submission from STINNER Victor victor.stin...@haypocalc.com:
The following test fails with an AssertionError('a' != 'b') on the first read.
import codecs
FILENAME = 'test'
with open(FILENAME, 'wb') as f:
f.write('abcd'.encode('utf-8'))
with codecs.open(FILENAME, 'r+', encoding='utf-8') as f:
f.write(1)
pos = f.writer.tell()
assert pos == 1, writer pos: %s != 1 % pos
pos = f.reader.tell()
assert pos == 1, reader pos: %s != 1 % pos
pos = f.stream.tell()
assert pos == 1, stream pos: %s != 1 % pos
# read() must call writer.flush()
char = f.read(1)
assert char == 'b', %r != 'b' % (char,)
# write() must rewind the raw stream
f.write('3')
tail = f.read()
assert tail == 'd', %r != 'd' % (tail,)
f.flush()
with open(FILENAME, 'rb') as f:
assert f.read() == b'1b3d'
I suppose that readline(), readlines() and __next__() have also issues.
See also issue #12215: similar issue with io.TextIOWrapper.
--
components: Library (Lib), Unicode
messages: 139975
nosy: haypo
priority: normal
severity: normal
status: open
title: codec.StreamReaderWriter: issues with interlaced read-write
versions: Python 2.7, Python 3.2, Python 3.3
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[issue12511] class/instance xyz has no attribute '_abc'
Andreas Hasenkopf webmas...@hasenkopf2000.net added the comment: I'd like to mention that Python 2.6.7 does not show this erroneous behavior. In Python 2.6.7 I can call the _write method of xml.sax.saxutils.XMLGenerator... Is this a bug or a feature in 2.7?? -- components: -XML ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12511 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12511] class/instance xyz has no attribute '_abc'
Andreas Hasenkopf webmas...@hasenkopf2000.net added the comment: The problem appeared to be the package from the Arch Linux repo. Compiling the source codes myselfes gave me a Python interpreter not showing this bug... -- resolution: - accepted status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12511 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12506] NIS module cant handle multiple NIS map entries for the same GID
Changes by bjorn lofdahl bjorn.lofd...@gmail.com: -- versions: +Python 3.1, Python 3.2, Python 3.3, Python 3.4 -Python 2.6, Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12506 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12506] NIS module cant handle multiple NIS map entries for the same GID
Changes by bjorn lofdahl bjorn.lofd...@gmail.com: -- versions: +Python 2.6, Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12506 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12511] class/instance xyz has no attribute '_abc'
Changes by Benjamin Peterson benja...@python.org: -- resolution: accepted - invalid ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12511 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12514] timeit disables garbage collection if timed code raises an exception
New submission from Gareth Rees g...@garethrees.org:
If you call timeit.timeit and the timed code raises an exception, then garbage
collection is disabled. I have verified this in Python 2.7 and 3.2. Here's an
interaction with Python 3.2:
Python 3.2 (r32:88445, Jul 7 2011, 15:52:49)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type help, copyright, credits or license for more information.
import timeit, gc
gc.isenabled()
True
timeit.timeit('raise Exception')
Traceback (most recent call last):
File stdin, line 1, in module
File
/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/timeit.py,
line 228, in timeit
return Timer(stmt, setup, timer).timeit(number)
File
/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/timeit.py,
line 194, in timeit
timing = self.inner(it, self.timer)
File timeit-src, line 6, in inner
Exception
gc.isenabled()
False
The problem is with the following code in Lib/timeit.py (lines 192–196):
gcold = gc.isenabled()
gc.disable()
timing = self.inner(it, self.timer)
if gcold:
gc.enable()
This should be changed to something like this:
gcold = gc.isenabled()
gc.disable()
try:
timing = self.inner(it, self.timer)
finally:
if gcold:
gc.enable()
--
components: Library (Lib)
messages: 139978
nosy: Gareth.Rees
priority: normal
severity: normal
status: open
title: timeit disables garbage collection if timed code raises an exception
type: behavior
versions: Python 2.7, Python 3.2
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[issue10403] Use member consistently
Éric Araujo mer...@netwok.org added the comment: Senthil, I’m not sure you read Alexander’s reply on Rietveld before committing. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10403 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12514] timeit disables garbage collection if timed code raises an exception
Gareth Rees g...@garethrees.org added the comment: Patch attached. -- keywords: +patch Added file: http://bugs.python.org/file22605/issue12514.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12514 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12514] timeit disables garbage collection if timed code raises an exception
Changes by Raymond Hettinger raymond.hettin...@gmail.com: -- assignee: - rhettinger nosy: +rhettinger ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12514 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12514] timeit disables garbage collection if timed code raises an exception
Raymond Hettinger raymond.hettin...@gmail.com added the comment: Thank you. The patch looks correct. I will apply it as soon as I get a chance. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12514 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12515] The email package modifies the message structure (when the parsed email is invalid)
New submission from xavierd xdelan...@cloudmark.com: the function 'email.message_from_file' modifies the message structure when the parsed is invalid (for example, when a closed boudary is missing). The attribute defects is also empty In the attachment (sample.tgz) you will find: - orig.eml : an email with an invalid structure The boundary 000101020201080900040301 isn't closed - after_parsing.eml: same email after calling email.message_from_file() The boundary is now closed. And the defects attribute is empty - test.py: python script to reproduce. -- components: None files: sample.tgz messages: 139982 nosy: r.david.murray, xavierd priority: normal severity: normal status: open title: The email package modifies the message structure (when the parsed email is invalid) versions: Python 2.6, Python 2.7 Added file: http://bugs.python.org/file22606/sample.tgz ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12515 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12504] packaging: fix uninstall and stop skipping its tests
Éric Araujo mer...@netwok.org added the comment: Thanks for that! I agree that it’s a fake optimization to work with generators instead of lists when the list is small or when we depend on other resources like file handles. There are a few methods we could change in the database module. The patch looks good, except that I wouldn’t move code to a nested function, but just change the “yield spam” line to “results.append(spam)”. In our message, is the test log showing failure something you got before making changes or after? IOW, does the patch fixes the bug? -- assignee: tarek - eric.araujo stage: - patch review title: Uninstall has disabled windows tests - packaging: fix uninstall and stop skipping its tests ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12504 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Éric Araujo mer...@netwok.org added the comment: Thanks a lot for the diagnosis. To fix it, I don’t find the monkey-patching approach very good, I’d prefer properly using the logging API to remove handlers upon cleanup. Would you like to look into that? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Antoine Pitrou pit...@free.fr added the comment: To fix it, I don’t find the monkey-patching approach very good, I’d prefer properly using the logging API to remove handlers upon cleanup. I don't think such stuff exists. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Éric Araujo mer...@netwok.org added the comment: See http://hg.python.org/cpython/file/tip/Lib/packaging/tests/support.py#l81 -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Antoine Pitrou pit...@free.fr added the comment: See http://hg.python.org/cpython/file/tip/Lib/packaging/tests/support.py#l81 AFAIU, the problem is that 2to3 creates a whole new logger for each different file. So it's not about cleaning the handlers, but cleaning up the loggers as well. And logging (deliberately, according to Vinay) doesn't provide any API to destroy loggers (they are de facto eternal). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12167] test_packaging reference leak
Éric Araujo mer...@netwok.org added the comment: Thanks for clarifying, I had misread. IMO, using one logger per file is a lib2to3 bug. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12167 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
