date:20130120

On Sun, Jan 20, 2013 at 8:17 PM, iMath redstone-c...@163.com wrote:
 so what is your opinion about single leading underscore and private methods 
 or attributes？

Didn't this get discussed recently?

http://mail.python.org/pipermail/python-list/2013-January/638687.html

ChrisA
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Re: Parent module adsite.adsiteviews.mainhanlder does not exist

2013-01-20 Thread Jason Friedman

 I created a django project using django 1.4.2. There is one 'app'(adsite) in 
 this project. And It works. But when I copied some 'py' files into the 'app' 
 folder, I got Parent module adsite.adsiteviews.mainhanlder does not exist. 
 Should I register the new files to __init__ in the 'app'? Did new coped files 
 break the import rules?

I do not know if this is your problem, and I know little about django,
but is mainhanlder a typographical error?
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Re: To make a method or attribute private

2013-01-20 Thread iMath

在 2013年1月17日星期四UTC+8上午9时04分00秒，alex23写道：
 On Jan 17, 10:34 am, iMath 2281570...@qq.com wrote:
 
  To make a method or attribute private (inaccessible from the outside), 
  simply start its
 
  name with two underscores
 
 
 
  but there is another saying goes:
 
  Beginning a variable name with a single underscore indicates that the 
  variable should be treated as ‘private’.
 
  I test both these 2 rules ,it seems only names that start with two 
  underscores are REAL private methods or attributes .
 
  so what is your opinion about single leading underscore and private methods 
  or attributes？
 
 
 
 The key word in the second quote is indicates. Placing a single
 
 underscore before an attribute name does nothing but _show_ other
 
 programmers that you consider this to be part of the implementation
 
 rather than the interface, and that you make no guarantees of its
 
 continued existence over time.
 
 
 
 More importantly, however: there is no real concept of private
 
 attributes in Python. Try this at the command prompt:
 
 
 
  ap._A__a
 
 '__a'
 
 
 
 It's still readable, and it's still writable too. The double-
 
 underscore naming is referred to as name mangling and while it's
 
 often passed off as the way to make private methods in Python (the
 
 tutorial even states this), what it is really intended for is to
 
 ensure that multiple inheritance works correctly:
 
 
 
  class A(object):
 
 ...   foo = 'A'
 
 ...   def get_A_foo(self):
 
 ... return self.foo
 
 ...
 
  class B(object):
 
 ...   foo = 'B'
 
 ...   def get_B_foo(self):
 
 ... return self.foo
 
 ...
 
  class C(A, B):
 
 ...   def __init__(self):
 
 ... super(C, self).__init__()
 
 ...
 
  c = C()
 
  c.get_A_foo()
 
 'A'
 
  c.get_B_foo()
 
 'A'
 
 
 
 Here, we haven't mangled the attribute 'foo' on either A or B, so on
 
 the instance of C, which inherits from both, the inherited methods are
 
 referring to the same attribute, which is A's in this case due to the
 
 method resolution order. By re-naming 'foo' on both A and B to
 
 '__foo', each can then refer to their _own_ attribute, and also allow
 
 for C to have its own 'foo' attribute which doesn't conflict with
 
 either of them:
 
 
 
  class A(object):
 
 ...   __foo = 'A'
 
 ...   def get_A_foo(self):
 
 ... return self.__foo
 
 ...
 
  class B(object):
 
 ...   __foo = 'B'
 
 ...   def get_B_foo(self):
 
 ... return self.__foo
 
 ...
 
  class C(A, B):
 
 ...   foo = 'C'
 
 ...   def __init__(self):
 
 ... super(C, self).__init__()
 
 ...
 
  c = C()
 
  c.get_A_foo()
 
 'A'
 
  c.get_B_foo()
 
 'B'
 
  c.foo
 
 'C'
 
 
 
 There is no way to make an externally private attribute. This is
 
 generally considered a good thing by most Python developers: if I
 
 _need_ to access your class's implementation, I can do so, but the
 
 name mangling forces me to be aware that this is something you don't
 
 recommend doing. You'll often hear the term consenting adults used
 
 to refer to this, meaning we can all decide for ourselves if we're
 
 willing to risk using an implementation detail.

what's the meaning of 'object' in 
class A(object)
and 
class B(object) ?
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Re: To make a method or attribute private

2013-01-20 Thread Steven D'Aprano

On Sun, 20 Jan 2013 06:52:32 -0800, iMath wrote:

[snip many dozens of lines of irrelevant text]

 what's the meaning of 'object' in
 class A(object)
 and
 class B(object) ?


Please trim your replies. We don't need to scroll past page after page of 
irrelevant text which we have already read.

object is the name of the base class defining common methods used by 
all new classes. In Python 2, you should always subclass object, unless 
you are subclassing something else. In Python 3, subclassing object is 
automatic, whether you write it or not.

In Python 2, if you fail to subclass object, you get an old-style 
class, and features like property, classmethod, staticmethod, super and 
multiple inheritance may not work at all, or be buggy.



-- 
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Re: PyWart: Exception error paths far too verbose

2013-01-20 Thread Terry Reedy


On 1/20/2013 1:08 AM, Steven D'Aprano wrote:

On Sat, 19 Jan 2013 19:15:55 -0800, Ramchandra Apte wrote:

[snip dozens of irrelevant quoted lines]

Right-click the file in the traceback and there is an Go to file/line
option.



Please trim your replies so that the reader doesn't have to scroll
through page after page of irrelevant text they've already read.

Thank you.


Quite aside from the fact that there already was a quick reply telling 
me the same thing. A properly threaded reader would have placed it just 
below my post.


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Re: ANN: Python training text movies

2013-01-20 Thread Franck Ditter

In article mailman.696.1358622153.2939.python-l...@python.org,
 Mitya Sirenef msire...@lightbird.net wrote:

 On 01/19/2013 04:32 AM, Franck Ditter wrote:
  In article mailman.488.1358146579.2939.python-l...@python.org,
Mitya Sirenef msire...@lightbird.net wrote:
 
  On 01/14/2013 01:34 AM, Franck Ditter wrote:
  In article mailman.469.1358088303.2939.python-l...@python.org,
 Jason Friedman ja...@powerpull.net wrote:
 
  That is right; I would also add that it may be overwhelming for a newbie
  to be reading through a large wall of text -- here you have blank
  space after the current paragraph so the attention is focused even more
  on the last few lines.
 
  Additionally, since instructions scroll automatically, I can space them
  out more than you would conventionally do in a manual.
 
  Pretty cool.
  When reading the source of the Web page which shows the scroll,
  I can't find the reference to the text displayed. Only text...
  How may we use the software which generates the Javascript ?
  Thanks, it's cool.
 
franck
  Thanks!
 
 the text is in var commands = ...
 
  You can download the generator script here:
 
  https://github.com/pythonbyexample/PBE/blob/master/code/jstmovie.py
 
  (you also need to grab  tmovies dir)
  When looking at the source of the page :
  http://lightbird.net/larks/tmovies/strings.html
  I find commands = []
  I can't guess where the strings displayed come from...
 
   franck
 
 Look 10 lines below that line.
 
 
 I have also added a related page that allows you to paste your own
 text to make a movie; it's linked from the same page with the
 list of generated t-movies.
 
 (that page does not let you use typewriter effect or custom pauses
 though).
 
   - mitya

I'm probably blind but 10 line after the line commands = [], I find :

var commands = [
[
text,
 
],
[
text,
 
],
]

but nothing concrete ! How come ?

franck
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Re: ANN: Python training text movies

2013-01-20 Thread Franck Ditter

In article nobody-b6cd7f.18373820012...@news.free.fr,
 Franck Ditter nob...@nowhere.org wrote:

 In article mailman.696.1358622153.2939.python-l...@python.org,
  Mitya Sirenef msire...@lightbird.net wrote:
 
  On 01/19/2013 04:32 AM, Franck Ditter wrote:
   In article mailman.488.1358146579.2939.python-l...@python.org,
 Mitya Sirenef msire...@lightbird.net wrote:
  
   On 01/14/2013 01:34 AM, Franck Ditter wrote:
   In article mailman.469.1358088303.2939.python-l...@python.org,
  Jason Friedman ja...@powerpull.net wrote:
  
   That is right; I would also add that it may be overwhelming for a 
   newbie
   to be reading through a large wall of text -- here you have blank
   space after the current paragraph so the attention is focused even 
   more
   on the last few lines.
  
   Additionally, since instructions scroll automatically, I can space 
   them
   out more than you would conventionally do in a manual.
  
   Pretty cool.
   When reading the source of the Web page which shows the scroll,
   I can't find the reference to the text displayed. Only text...
   How may we use the software which generates the Javascript ?
   Thanks, it's cool.
  
 franck
   Thanks!
  
  the text is in var commands = ...
  
   You can download the generator script here:
  
   https://github.com/pythonbyexample/PBE/blob/master/code/jstmovie.py
  
   (you also need to grab  tmovies dir)
   When looking at the source of the page :
   http://lightbird.net/larks/tmovies/strings.html
   I find commands = []
   I can't guess where the strings displayed come from...
  
franck
  
  Look 10 lines below that line.
  
  
  I have also added a related page that allows you to paste your own
  text to make a movie; it's linked from the same page with the
  list of generated t-movies.
  
  (that page does not let you use typewriter effect or custom pauses
  though).
  
- mitya
 
 I'm probably blind but 10 line after the line commands = [], I find :
 
 var commands = [
 [
 text,
  
 ],
 [
 text,
  
 ],
 ]
 
 but nothing concrete ! How come ?
 
 franck

OK OK found ! Thanks.

   franck
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Re: ANN: Python training text movies

2013-01-20 Thread Franck Ditter

In article nobody-a71b2d.18413120012...@news.free.fr,
 Franck Ditter nob...@nowhere.org wrote:

 In article nobody-b6cd7f.18373820012...@news.free.fr,
  Franck Ditter nob...@nowhere.org wrote:
 
  In article mailman.696.1358622153.2939.python-l...@python.org,
   Mitya Sirenef msire...@lightbird.net wrote:
  
   On 01/19/2013 04:32 AM, Franck Ditter wrote:
In article mailman.488.1358146579.2939.python-l...@python.org,
  Mitya Sirenef msire...@lightbird.net wrote:
   
On 01/14/2013 01:34 AM, Franck Ditter wrote:
In article mailman.469.1358088303.2939.python-l...@python.org,
   Jason Friedman ja...@powerpull.net wrote:
   
That is right; I would also add that it may be overwhelming for a 
newbie
to be reading through a large wall of text -- here you have blank
space after the current paragraph so the attention is focused even 
more
on the last few lines.
   
Additionally, since instructions scroll automatically, I can space 
them
out more than you would conventionally do in a manual.
   
Pretty cool.
When reading the source of the Web page which shows the scroll,
I can't find the reference to the text displayed. Only text...
How may we use the software which generates the Javascript ?
Thanks, it's cool.
   
  franck
Thanks!
   
   the text is in var commands = ...
   
You can download the generator script here:
   
https://github.com/pythonbyexample/PBE/blob/master/code/jstmovie.py
   
(you also need to grab  tmovies dir)
When looking at the source of the page :
http://lightbird.net/larks/tmovies/strings.html
I find commands = []
I can't guess where the strings displayed come from...
   
 franck
   
   Look 10 lines below that line.
   
   
   I have also added a related page that allows you to paste your own
   text to make a movie; it's linked from the same page with the
   list of generated t-movies.
   
   (that page does not let you use typewriter effect or custom pauses
   though).
   
 - mitya
  
  I'm probably blind but 10 line after the line commands = [], I find :
  
  var commands = [
  [
  text,
   
  ],
  [
  text,
   
  ],
  ]
  
  but nothing concrete ! How come ?
  
  franck
 
 OK OK found ! Thanks.
 
franck

When executing jstmovie.py, it complains :
'template.html' not found in tmovies...

franck

tmovies/template.html
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Re: ANN: Python training text movies


On 01/20/2013 12:54 PM, Franck Ditter wrote:

In article  nobody-a71b2d.18413120012...@news.free.fr,

 Franck Ditter nob...@nowhere.org wrote:

 In article nobody-b6cd7f.18373820012...@news.free.fr,
 Franck Ditter nob...@nowhere.org wrote:

 In article mailman.696.1358622153.2939.python-l...@python.org,
 Mitya Sirenef msire...@lightbird.net wrote:

 On 01/19/2013 04:32 AM, Franck Ditter wrote:
 In article mailman.488.1358146579.2939.python-l...@python.org,
 Mitya Sirenef msire...@lightbird.net wrote:

 On 01/14/2013 01:34 AM, Franck Ditter wrote:
 In article mailman.469.1358088303.2939.python-l...@python.org,
 Jason Friedman ja...@powerpull.net wrote:

 That is right; I would also add that it may be overwhelming 
for a newbie
 to be reading through a large wall of text -- here you have 
blank
 space after the current paragraph so the attention is focused 
even more

 on the last few lines.

 Additionally, since instructions scroll automatically, I can 
space them

 out more than you would conventionally do in a manual.

 Pretty cool.
 When reading the source of the Web page which shows the scroll,
 I can't find the reference to the text displayed. Only text...
 How may we use the software which generates the Javascript ?
 Thanks, it's cool.

 franck
 Thanks!

 the text is in var commands = ...

 You can download the generator script here:

 https://github.com/pythonbyexample/PBE/blob/master/code/jstmovie.py

 (you also need to grab tmovies dir)
 When looking at the source of the page :
 http://lightbird.net/larks/tmovies/strings.html
 I find commands = []
 I can't guess where the strings displayed come from...

 franck

 Look 10 lines below that line.


 I have also added a related page that allows you to paste your own
 text to make a movie; it's linked from the same page with the
 list of generated t-movies.

 (that page does not let you use typewriter effect or custom pauses
 though).

 - mitya

 I'm probably blind but 10 line after the line commands = [], I find :

 var commands = [
 [
 text,
  
 ],
 [
 text,
  
 ],
 ]

 but nothing concrete ! How come ?

 franck

 OK OK found ! Thanks.

 franck

 When executing jstmovie.py, it complains :
 'template.html' not found in tmovies...

 franck

 tmovies/template.html

As I've said upthread, you need to download tmovies dir from
the same repository where jstmovie.py is located:

https://github.com/pythonbyexample/PBE/tree/master/code/


 - mitya



--
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Admiration for a quality or an art can be so strong that it deters us from
striving to possess it.  Friedrich Nietzsche

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Re: Messing with the GC

2013-01-20 Thread Jens Thoms Toerring


Hi,

thank you for the explanations. I had overlooked the
cyclic nature of what I had produced here and, of course,
the GC can't be blamed for not collecting objects that are
part of a cycle. The other question about the last refe-
rence to an object vanishing within a method call (which,
as I now clearly understand, can't happen and wouldn't make
much sense) was triggered by a segmentation fault I get
when I do something similar in PySide, so I was getting
worried if it might be due to a GC issue. Now I know its
got to be something different;-)

 Thanks and best regards, Jens
-- 
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   \__  http://toerring.de
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RE Help splitting CVS data

2013-01-20 Thread Garry

I'm trying to manipulate family tree data using Python.
I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
cvs files
The data appears in this format:

Marriage,Husband,Wife,Date,Place,Source,Note0x0a
Note: the Source field or the Note field can contain quoted data (same as the 
Place field)

Actual data:
[F0244],[I0690],[I0354],1916-06-08,Neely's Landing, Cape Gir. Co, MO,,0x0a
[F0245],[I0692],[I0355],1919-09-04,Cape Girardeau Co, MO,,0x0a

code snippet follows:

import os
import re
#I'm using the following regex in an attempt to decode the data:
RegExp2 = 
^(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\d{,4}\-\d{,2}\-\d{,2})\,(.*|\.*\)\,(.*|\.*\)\,(.*|\.*\)
#
line = [F0244],[I0690],[I0354],1916-06-08,\Neely's Landing, Cape Gir. Co, 
MO\,,
#
(Marriage,Husband,Wife,Date,Place,Source,Note) = re.split(RegExp2,line)
#
#However, this does not decode the 7 fields.
# The following error is displayed:
Traceback (most recent call last):
  File stdin, line 1, in module
ValueError: too many values to unpack
#
# When I use xx the fields apparently get unpacked.
xx = re.split(RegExp2,line)
#
 print xx[0]

 print xx[1]
[F0244]
 print xx[5]
Neely's Landing, Cape Gir. Co, MO
 print xx[6]

 print xx[7]

 print xx[8]

Why is there an extra NULL field before and after my record contents?
I'm stuck, comments and solutions greatly appreciated.

Garry 

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Re: RE Help splitting CVS data


On 01/20/2013 05:04 PM, Garry wrote:

I'm trying to manipulate family tree data using Python.
I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
cvs files
The data appears in this format:

Marriage,Husband,Wife,Date,Place,Source,Note0x0a
Note: the Source field or the Note field can contain quoted data (same as the 
Place field)

Actual data:
[F0244],[I0690],[I0354],1916-06-08,Neely's Landing, Cape Gir. Co, MO,,0x0a
[F0245],[I0692],[I0355],1919-09-04,Cape Girardeau Co, MO,,0x0a

code snippet follows:

import os
import re
#I'm using the following regex in an attempt to decode the data:
RegExp2 = 
^(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\d{,4}\-\d{,2}\-\d{,2})\,(.*|\.*\)\,(.*|\.*\)\,(.*|\.*\)
#
line = [F0244],[I0690],[I0354],1916-06-08,\Neely's Landing, Cape Gir. Co, 
MO\,,
#
(Marriage,Husband,Wife,Date,Place,Source,Note) = re.split(RegExp2,line)
#
#However, this does not decode the 7 fields.
# The following error is displayed:
Traceback (most recent call last):
   File stdin, line 1, in module
ValueError: too many values to unpack
#
# When I use xx the fields apparently get unpacked.
xx = re.split(RegExp2,line)
#

print xx[0]
print xx[1]

[F0244]

print xx[5]

Neely's Landing, Cape Gir. Co, MO

print xx[6]
print xx[7]
print xx[8]

Why is there an extra NULL field before and after my record contents?
I'm stuck, comments and solutions greatly appreciated.

Garry




Gosh, you really don't want to use regex to split csv lines like that

Use csv module:

 s
'[F0244],[I0690],[I0354],1916-06-08,Neely\'s Landing, Cape Gir. Co, 
MO,,0x0a'

 import csv
 r = csv.reader([s])
 for l in r: print(l)
...
['[F0244]', '[I0690]', '[I0354]', '1916-06-08', Neely's Landing, Cape 
Gir. Co, MO, '', '0x0a']



the arg to csv.reader can be the file object (or a list of lines).

 - mitya


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Re: Messing with the GC

2013-01-20 Thread Terry Reedy


On 1/20/2013 3:09 PM, Jens Thoms Toerring wrote:


 thank you for the explanations. I had overlooked the
cyclic nature of what I had produced here and, of course,
the GC can't be blamed for not collecting objects that are
part of a cycle. The other question about the last refe-
rence to an object vanishing within a method call (which,
as I now clearly understand, can't happen and wouldn't make
much sense) was triggered by a segmentation fault I get
when I do something similar in PySide, so I was getting
worried if it might be due to a GC issue. Now I know its
got to be something different;-)


Perhaps the hardest part of writing C extensions to CPython directly in 
C (versus something like Cython) is properly balancing increfs and 
decrefs. An incref without a later decref can lead to a memory leak. A 
decref without a preceding incref (so CPython thinks the object can be 
deleted, when it should not be) can lead to segfaults. So I would report 
PySide code leading to segfaults to the PySide people.


--
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Re: RE Help splitting CVS data

2013-01-20 Thread Terry Reedy


On 1/20/2013 5:04 PM, Garry wrote:

I'm trying to manipulate family tree data using Python.
I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
cvs files

...

I'm stuck, comments and solutions greatly appreciated.


Why are you not using the cvs module?

--
Terry Jan Reedy

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Re: Help splitting CVS data

2013-01-20 Thread Dave Angel


On 01/20/2013 05:04 PM, Garry wrote:

I'm trying to manipulate family tree data using Python.
I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
cvs files
The data appears in this format:

Marriage,Husband,Wife,Date,Place,Source,Note0x0a
Note: the Source field or the Note field can contain quoted data (same as the 
Place field)

Actual data:
[F0244],[I0690],[I0354],1916-06-08,Neely's Landing, Cape Gir. Co, MO,,0x0a
[F0245],[I0692],[I0355],1919-09-04,Cape Girardeau Co, MO,,0x0a

code snippet follows:

import os
import re
#I'm using the following regex in an attempt to decode the data:
RegExp2 = 
^(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\d{,4}\-\d{,2}\-\d{,2})\,(.*|\.*\)\,(.*|\.*\)\,(.*|\.*\)
#


Well, you lost me about there.  For a csv file, why not use the csv module:


import csv

ifile  = open('test.csv', rb)
reader = csv.reader(ifile)


For reference, see http://docs.python.org/2/library/csv.html

and for sample use and discussion, see

http://www.linuxjournal.com/content/handling-csv-files-python

--
DaveA
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Re: To make a method or attribute private

On Jan 20, 7:23 pm, Chris Angelico ros...@gmail.com wrote:
 On Sun, Jan 20, 2013 at 8:17 PM, iMath redstone-c...@163.com wrote:
  so what is your opinion about single leading underscore and private methods 
  or attributes？

 Didn't this get discussed recently?

 http://mail.python.org/pipermail/python-list/2013-January/638687.html

 ChrisA

Isn't that a link to the same post that started this thread? :)
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Re: To make a method or attribute private

2013-01-20 Thread Dave Angel


On 01/20/2013 06:14 PM, alex23 wrote:

On Jan 20, 7:23 pm, Chris Angelico ros...@gmail.com wrote:

On Sun, Jan 20, 2013 at 8:17 PM, iMath redstone-c...@163.com wrote:

so what is your opinion about single leading underscore and private methods or 
attributes？


Didn't this get discussed recently?

http://mail.python.org/pipermail/python-list/2013-January/638687.html

ChrisA


Isn't that a link to the same post that started this thread? :)



No, that's the one that started the earlier thread, by the same name, 
three whole days ago.  iMath posted an apparently complete duplicate of 
his earlier message.



--
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Re: RE Help splitting CVS data

2013-01-20 Thread Tim Chase


On 01/20/13 16:16, Terry Reedy wrote:

On 1/20/2013 5:04 PM, Garry wrote:

I'm trying to manipulate family tree data using Python.
I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
cvs files

...

I'm stuck, comments and solutions greatly appreciated.


Why are you not using the cvs module?


that's an easy answer:

 import cvs
Traceback (most recent call last):
  File stdin, line 1, in module
ImportError: No module named cvs


Now the *csv* module... ;-)

-tkc




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Re: ANN: Python training text movies

2013-01-20 Thread Steven D'Aprano

On Sun, 20 Jan 2013 18:54:03 +0100, Franck Ditter wrote:

[snip quoting NINE levels deep]

 When executing jstmovie.py, it complains : 'template.html' not found in
 tmovies...

Please trim unnecessary quoted text out of your replies. We don't need to 
read page after page of irrelevant comments that we've already read 
before.

Thank you.

If there is more quoted text than new text you have written, or quoting 
exceeds 3, maybe 4 levels deep, then there probably is too much 
unnecessary quoting.


-- 
Steven
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Re: RE Help splitting CVS data

2013-01-20 Thread Garry

On Sunday, January 20, 2013 3:04:39 PM UTC-7, Garry wrote:
 I'm trying to manipulate family tree data using Python.
 
 I'm using linux and Python 2.7.3 and have data files saved as Linux formatted 
 cvs files
 
 The data appears in this format:
 
 
 
 Marriage,Husband,Wife,Date,Place,Source,Note0x0a
 
 Note: the Source field or the Note field can contain quoted data (same as the 
 Place field)
 
 
 
 Actual data:
 
 [F0244],[I0690],[I0354],1916-06-08,Neely's Landing, Cape Gir. Co, MO,,0x0a
 
 [F0245],[I0692],[I0355],1919-09-04,Cape Girardeau Co, MO,,0x0a
 
 
 
 code snippet follows:
 
 
 
 import os
 
 import re
 
 #I'm using the following regex in an attempt to decode the data:
 
 RegExp2 = 
 ^(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\[[A-Z]\d{1,}\])\,(\d{,4}\-\d{,2}\-\d{,2})\,(.*|\.*\)\,(.*|\.*\)\,(.*|\.*\)
 
 #
 
 line = [F0244],[I0690],[I0354],1916-06-08,\Neely's Landing, Cape Gir. Co, 
 MO\,,
 
 #
 
 (Marriage,Husband,Wife,Date,Place,Source,Note) = re.split(RegExp2,line)
 
 #
 
 #However, this does not decode the 7 fields.
 
 # The following error is displayed:
 
 Traceback (most recent call last):
 
   File stdin, line 1, in module
 
 ValueError: too many values to unpack
 
 #
 
 # When I use xx the fields apparently get unpacked.
 
 xx = re.split(RegExp2,line)
 
 #
 
  print xx[0]
 
 
 
  print xx[1]
 
 [F0244]
 
  print xx[5]
 
 Neely's Landing, Cape Gir. Co, MO
 
  print xx[6]
 
 
 
  print xx[7]
 
 
 
  print xx[8]
 
 
 
 Why is there an extra NULL field before and after my record contents?
 
 I'm stuck, comments and solutions greatly appreciated.
 
 
 
 Garry

Thanks everyone for your comments.  I'm new to Python, but can get around in 
Perl and regular expressions.  I sure was taking the long way trying to get the 
cvs data parsed.  

Sure hope to teach myself python.  Maybe I need to look into courses offered at 
the local Jr College!

Garry
 
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Re: How do functions get access to builtins?

2013-01-20 Thread Rouslan Korneychuk


On 01/19/2013 09:59 PM, Steven D'Aprano wrote:

I've been playing around with ChainedMap in Python 3.3, and run into
something which perplexes me. Let's start with an ordinary function that
accesses one global and one builtin.


x = 42
def f():
 print(x)


If you call f(), it works as expected. But let's make a version with no
access to builtins, and watch it break:

from types import FunctionType
g = FunctionType(f.__code__, {'x': 23})


If you call g(), you get an exception:

py g()
Traceback (most recent call last):
   File stdin, line 1, in module
   File stdin, line 2, in f
NameError: global name 'print' is not defined


(Don't be fooled by the traceback referring to f rather than g.
That's because g's code was copied from f.)

We can add support for builtins:

import builtins  # use __builtin__ with no s in Python 2
g.__globals__['__builtins__'] = builtins  # Note the s in the key.


and now calling g() prints 23, as expected.

Now let me try the same thing using Python 3.3's ChainMap. Unfortunately,
functions insist that their __global__ is a dict, so we fool it into
accepting a ChainMap with some multiple inheritance trickery:


from collections import ChainMap
class ChainedDict(ChainMap, dict):
 pass

d = ChainedDict({}, {'x': 23}, {'x': 42})
assert d['x'] == 23
g = FunctionType(f.__code__, d)


As before, calling g() raises NameError, global name 'print' is not
defined. So I expected to be able to fix it just as I did before:

g.__globals__['__builtins__'] = builtins


But it doesn't work -- I still get the same NameError. Why does this not
work here, when it works for a regular dict?



I found the answer in Python's source code. When you execute a code 
object, PyFrame_New is called which gets 'bultins' from 'globals', but 
inside PyFrame_New (defined on line 596 of Objects/frameobject.c) is the 
following (line 613):


  builtins = PyDict_GetItem(globals, builtin_object);

Unlike PyObject_GetItem, PyDict_GetItem is specialized for dict objects. 
Your ChainedDict class uses ChainMaps's storage and leaves dict's 
storage empty, so PyDict_GetItem doesn't find anything.




I can fix it by adding the builtins into the ChainMap:

g.__globals__.maps.append(builtins.__dict__)


And now calling g() prints 23 as expected.



The reason this works is unlike PyFrame_New, the LOAD_GLOBAL opcode 
first checks if globals' type is dict (and not a subclass), and falls 
back to using PyObject_GetItem if it's anything else.



Interestingly: it looks like it could be fixed easily enough. Unless 
there are other places where globals is assumed to be a dict object, it 
would just be a matter of doing the same check and fallback in 
PyFrame_New that is done in LOAD_GLOBAL (technically, you could just use 
PyObject_GetItem; obviously, this is an optimization).



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Re: Messing with the GC

2013-01-20 Thread Jens Thoms Toerring

Terry Reedy tjre...@udel.edu wrote:
 On 1/20/2013 3:09 PM, Jens Thoms Toerring wrote:

   thank you for the explanations. I had overlooked the
  cyclic nature of what I had produced here and, of course,
  the GC can't be blamed for not collecting objects that are
  part of a cycle. The other question about the last refe-
  rence to an object vanishing within a method call (which,
  as I now clearly understand, can't happen and wouldn't make
  much sense) was triggered by a segmentation fault I get
  when I do something similar in PySide, so I was getting
  worried if it might be due to a GC issue. Now I know its
  got to be something different;-)

 Perhaps the hardest part of writing C extensions to CPython directly in
 C (versus something like Cython) is properly balancing increfs and
 decrefs. An incref without a later decref can lead to a memory leak. A
 decref without a preceding incref (so CPython thinks the object can be
 deleted, when it should not be) can lead to segfaults.

Definitely - I got started with Python having to write glue
code to get Python to work with a C++ library. And keeping
track of which side thinks it owns an object can sometimes
be a bit of a challenge...

 So I would report PySide code leading to segfaults to the
 PySide people.

Now that I'm more sure that it's unlikely to be a Python GC
related issue (or my not understanding what I'm doing, to be
precise) this is on my to-do list. But first I have to distill
things down to a very short example program still exhibiting
the problem - and experience tells me that this will most li-
kely result in the realization that it's not a PySide issue
at all but some misunderstanding on my side;-)

 Best regards, Jens
-- 
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   \__  http://toerring.de
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Re: To make a method or attribute private

2013-01-20 Thread iMath

在 2013年1月17日星期四UTC+8上午8时34分22秒，iMath写道：
 To make a method or attribute private (inaccessible from the outside), simply 
 start its 
 name with two underscores
 
 
 《Beginning Python From Novice to Professional》
 
 
 but there is another saying goes:
 Beginning a variable name with a single underscore indicates that the 
 variable should be treated as ‘private’.
 
 
 I test both these 2 rules ,it seems only names that start with two 
 underscores are REAL private methods or attributes .
 
 
  class A:
 ...     def __init__(self):
 ...         self.a = 'a'
 ...         self._a = '_a'
 ...         self.__a = '__a'
 ...
 
 
 
 
 
 
  ap = A()
  ap.a
 'a'
  ap._a
 '_a'
  ap.__a
 Traceback (most recent call last):
   File stdin, line 1, in ?
 AttributeError: A instance has no attribute '__a'
 
 
 so what is your opinion about single leading underscore and private methods 
 or attributes？

so there is no REAL private variable in Python but conversion exists in it that 
python programmer should follow and recognize .right ?
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Re: To make a method or attribute private

On Mon, Jan 21, 2013 at 12:14 PM, iMath redstone-c...@163.com wrote:
 so there is no REAL private variable in Python but conversion exists in it 
 that python programmer should follow and recognize .right ?

That's about it. If you think about C++ public members as the
interface and private/protected members as the implementation,
then Python's convention is a leading underscore on the latter; you
can reasonably expect that non-underscore members can be trusted to be
maintained, but underscored members will quite possibly change in
subsequent versions.

Among smart people, conventions like this are all you need.

ChrisA
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Re: RE Help splitting CVS data

On Mon, Jan 21, 2013 at 11:41 AM, Garry ggkrae...@gmail.com wrote:
 Thanks everyone for your comments.  I'm new to Python, but can get around in 
 Perl and regular expressions.  I sure was taking the long way trying to get 
 the cvs data parsed.

As has been hinted by Tim, you're actually talking about csv data -
Comma Separated Values. Not to be confused with cvs, an old vcs. (See?
The v can go anywhere...) Not a big deal, but it's much easier to find
stuff on PyPI or similar when you have the right keyword to search
for!

ChrisA
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Re: To make a method or attribute private

On Jan 21, 9:32 am, Dave Angel d...@davea.name wrote:
 On 01/20/2013 06:14 PM, alex23 wrote:

  On Jan 20, 7:23 pm, Chris Angelico ros...@gmail.com wrote:
  On Sun, Jan 20, 2013 at 8:17 PM, iMath redstone-c...@163.com wrote:
  so what is your opinion about single leading underscore and private 
  methods or attributes？

  Didn't this get discussed recently?

 http://mail.python.org/pipermail/python-list/2013-January/638687.html

  ChrisA

  Isn't that a link to the same post that started this thread? :)

 No, that's the one that started the earlier thread, by the same name,
 three whole days ago.  iMath posted an apparently complete duplicate of
 his earlier message.

The link is to a post of the same date as the original of this thread,
and the very first response is mine, same as with this thread. I'm
still not seeing the dupe?
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Re: To make a method or attribute private


On 01/20/2013 09:24 PM, alex23 wrote:

On Jan 21, 9:32 am, Dave Angel  d...@davea.name wrote:

 On 01/20/2013 06:14 PM, alex23 wrote:

 On Jan 20, 7:23 pm, Chris Angelico ros...@gmail.com wrote:
 On Sun, Jan 20, 2013 at 8:17 PM, iMath redstone-c...@163.com wrote:
 so what is your opinion about single leading underscore and 
private methods or attributes？


 Didn't this get discussed recently?

 http://mail.python.org/pipermail/python-list/2013-January/638687.html

 ChrisA

 Isn't that a link to the same post that started this thread? :)

 No, that's the one that started the earlier thread, by the same name,
 three whole days ago. iMath posted an apparently complete duplicate of
 his earlier message.

 The link is to a post of the same date as the original of this thread,
 and the very first response is mine, same as with this thread. I'm
 still not seeing the dupe?

I do see the duplicate in my reader..  -m


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To knock a thing down, especially if it is cocked at an arrogant angle, is
a deep delight of the blood.
George Santayana


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Re: To make a method or attribute private

2013-01-20 Thread Steven D'Aprano

On Sun, 20 Jan 2013 17:14:36 -0800, iMath wrote:

[...]
 so there is no REAL private variable in Python but conversion exists in
 it that python programmer should follow and recognize .right ?

There are no REAL private variables in most languages. Consider the C++ 
trick #define private public. Or pointer tricks, or using reflection in 
Java.

Yes, the convention in Python is that names starting with a single 
underscore should be considered private implementation details.



-- 
Steven
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Else statement executing when it shouldnt

an else statement is running when it shouldnt be. It is on the last line. 
Whenever i am in the math or game function, when i type in main, it goes back 
to the start of the program, but it also says not a valid function. I am 
stumped!
Here is my code:
#Cmd 
#Created By Eli M.
#import modules
import random
import math
gtn = 0
print (Type in help for a list of cmd functions)
#initiate main loop
cmd = 0
while cmd == 0:
#ask for input on function
function = raw_input(Type in a function:)
#start math loop
if function == math:
run = 0
while run == 0:
#ask for math operation
type = raw_input(What math operation do you want to use?)
if type == multiplication:
x = raw_input(Type in your first number:)
y = raw_input(Multiply your first number by:)
try:
ans = int(x) * int(y)
print (ans)
try:
ans = float(x) * float(y)
print (ans)
except ValueError, err:
print (Not a valid number)
except OverflowError, err:
print (Number too large)
#division math function
if type == division:
x = raw_input(Type in your first number:)
y = raw_input(Divide your first number by:)
try:
ans = float(x) / float(y)
print (ans)
except ZeroDivisionError, err:
print (Can't divide by zero)
except ValueError, err:
print (Not a valid number)
except OverflowError, err:
print (Number too large)
#subtraction math function
if type == subtraction:
x = raw_input(Type in your first number:)
y = raw_input(Subtract your first number by:)
try:
ans = float(x) - float(y)
print (ans)
except ValueError, err:
print (Not a valid number)
#addition math function
if type == addition:
x = raw_input(Type in your first number:)
y = raw_input(Add your first number by:)
try:
ans = float(x) + float(y)
print (ans)
except ValueError, err:
try:
ans = int(x) + int(y)
print (ans)
except ValueError, err:
print (Not a valid number)
except OverflowError, err:
print (Number too large)
#square root math function
if type == square root:
x = raw_input(Type in your number:)
try:
y = float(x)
z = math.sqrt(y)
print (z)
except ValueError, err:
print (Not a valid number)
except OverflowError, err:
print (Number too large)

#to the power of... math function
if type == power:
x = raw_input(Type in your number:)
y = raw_input(Multiply your first number by the power of:)
try:
ans = float(x) ** float(y)
print (ans)
except OverflowError, err:
print (Number too large)
except ValueError, err:
print (Not a valid number)
#break the math loop
if type == main:
run = 1
#absolute value math function
if type == absolute value:
try:
x = float(raw_input(Type in your number:))
y = math.fabs(x)
print (y)
except ValueError, err:
print (Not a valid number)
if function == random number:
try:
x = int(raw_input(Minimum number:))
y = int(raw_input(Maximum number:))
num = random.randint(x, y)
print (num)
except ValueError, err:
print (Not a valid number)
if function == games:
games = 0
while games == 0:
gamechoice = raw_input(What game do you want to play:)
if gamechoice == guess the number:
run = 0
while run == 0:
print (I am thinking of a number between 1 and 20)
num = random.randint(1, 20)
num = int(num)
guesses = 0
guessestaken = 0
while guesses == 0:
try:
guess =

Re: To make a method or attribute private

On Mon, Jan 21, 2013 at 2:27 PM, Steven D'Aprano
steve+comp.lang.pyt...@pearwood.info wrote:
 On Sun, 20 Jan 2013 17:14:36 -0800, iMath wrote:

 [...]
 so there is no REAL private variable in Python but conversion exists in
 it that python programmer should follow and recognize .right ?

 There are no REAL private variables in most languages. Consider the C++
 trick #define private public. Or pointer tricks, or using reflection in
 Java.

Uhh, that's like saying there are no REAL floats in C, because you can
#define float int
And pointer tricks, well, you can do anything with raw memory access.
These aren't proofs that something doesn't exist, they're proofs that
trying to enforce privacy is bound to fail - so you may as well strip
that code from your compiler/interpreter and go with the Python style.
Much easier.

I agree with your point, just not your argument. :)

ChrisA
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Re: Else statement executing when it shouldnt

2013-01-20 Thread Roy Smith

In article 2cc6791f-ba56-406c-a5b0-b23023caf...@googlegroups.com,
 eli m techgeek...@gmail.com wrote:

 an else statement is running when it shouldnt be. It is on the last line. 
 Whenever i am in the math or game function, when i type in main, it goes back 
 to the start of the program, but it also says not a valid function. I am 
 stumped!
 Here is my code:

[many lines of code elided]

TL;DNR :-)

A basic debugging technique is to try to find the minimum amount of code 
that can reproduce the problem.

Find some hunk of lines that you're pretty sure can't be at fault, and 
delete them.  See if you can still reproduce the problem.  Assuming you 
can, delete another hunk of code.  Keep going until you're down to the 
smallest possible amount of code which demonstrates the problem.

There's a couple of good things that come out of this.  One is that it's 
likely that in the course of doing this, you'll figure out what's wrong.  
The other is that if you can't figure it out, at least now you'll have 
something that's easy to show somebody else when you ask for help.
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Re: Else statement executing when it shouldnt

On Mon, Jan 21, 2013 at 3:40 PM, eli m techgeek...@gmail.com wrote:
 an else statement is running when it shouldnt be. It is on the last line. 
 Whenever i am in the math or game function, when i type in main, it goes back 
 to the start of the program, but it also says not a valid function. I am 
 stumped!

Check your indentation levels. I see a few things here that look odd:

 if function == help:
 while helpfunc == 0:
 if helpmain == main:
 else:

What is the else meant to bind to? The innermost if? The 'if function
== help'? It's currently binding to the while.

Recommendation: Break this up! Your main loop is huge! It's way too
easy to get lost in it. And while you're at it, consider unifying some
of the similar blocks of code. The solution to both issues is simple:
Use functions. Have you been taught about them yet?

Also, side tip: Be honest about homework. I'm fairly sure that's what
this is. :)

ChrisA
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Re: Else statement executing when it shouldnt

On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
 You have to break while loop not to execute else branch
 
 
 Rene
 
 
 
Can you explain in more detail please.
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Re: Else statement executing when it shouldnt

2013-01-20 Thread René Klačan

You have to break while loop not to execute else branch

Rene

On Mon, Jan 21, 2013 at 5:40 AM, eli m techgeek...@gmail.com wrote:

 an else statement is running when it shouldnt be. It is on the last line.
 Whenever i am in the math or game function, when i type in main, it goes
 back to the start of the program, but it also says not a valid function. I
 am stumped!
 Here is my code:
 #Cmd
 #Created By Eli M.
 #import modules
 import random
 import math
 gtn = 0
 print (Type in help for a list of cmd functions)
 #initiate main loop
 cmd = 0
 while cmd == 0:
 #ask for input on function
 function = raw_input(Type in a function:)
 #start math loop
 if function == math:
 run = 0
 while run == 0:
 #ask for math operation
 type = raw_input(What math operation do you want to use?)
 if type == multiplication:
 x = raw_input(Type in your first number:)
 y = raw_input(Multiply your first number by:)
 try:
 ans = int(x) * int(y)
 print (ans)
 try:
 ans = float(x) * float(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #division math function
 if type == division:
 x = raw_input(Type in your first number:)
 y = raw_input(Divide your first number by:)
 try:
 ans = float(x) / float(y)
 print (ans)
 except ZeroDivisionError, err:
 print (Can't divide by zero)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #subtraction math function
 if type == subtraction:
 x = raw_input(Type in your first number:)
 y = raw_input(Subtract your first number by:)
 try:
 ans = float(x) - float(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 #addition math function
 if type == addition:
 x = raw_input(Type in your first number:)
 y = raw_input(Add your first number by:)
 try:
 ans = float(x) + float(y)
 print (ans)
 except ValueError, err:
 try:
 ans = int(x) + int(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #square root math function
 if type == square root:
 x = raw_input(Type in your number:)
 try:
 y = float(x)
 z = math.sqrt(y)
 print (z)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)

 #to the power of... math function
 if type == power:
 x = raw_input(Type in your number:)
 y = raw_input(Multiply your first number by the power
 of:)
 try:
 ans = float(x) ** float(y)
 print (ans)
 except OverflowError, err:
 print (Number too large)
 except ValueError, err:
 print (Not a valid number)
 #break the math loop
 if type == main:
 run = 1
 #absolute value math function
 if type == absolute value:
 try:
 x = float(raw_input(Type in your number:))
 y = math.fabs(x)
 print (y)
 except ValueError, err:
 print (Not a valid number)
 if function == random number:
 try:
 x = int(raw_input(Minimum number:))
 y = int(raw_input(Maximum number:))
 num = random.randint(x, y)
 print (num)
 except ValueError, err:
 print (Not a valid number)
 if function == games:
 games = 0
 while games == 0:
 gamechoice = raw_input(What game do you want to play:)
 if gamechoice == guess the number:
 run = 0
 while run == 0:
 print (I am thinking of a number between 1 and 20)

Re: Else statement executing when it shouldnt


 
 
 
 Your else is lined up with while, not with if.
 
 
 
   -m
 
 
 
 
 
 -- 
 
 Lark's Tongue Guide to Python: http://lightbird.net/larks/
 
 
 
 When a friend succeeds, I die a little.  Gore Vidal
Its lined up. It got messed up when i copied the code into the post.

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Re: Else statement executing when it shouldnt

On Sunday, January 20, 2013 8:40:47 PM UTC-8, eli m wrote:
hint: Use the comments in the code to find out where my error is.
 
 Here is my code:
 
 #Cmd 
 
 #Created By Eli M.
 
 #import modules
 
 import random
 
 import math
 
 gtn = 0
 
 print (Type in help for a list of cmd functions)
 
 #initiate main loop
 
 cmd = 0
 
 while cmd == 0:
 
 #ask for input on function
 
 function = raw_input(Type in a function:)
 
 #start math loop
 
 if function == math:
 
 run = 0
 
 while run == 0:
 
 #ask for math operation
 
 type = raw_input(What math operation do you want to use?)
 
 if type == multiplication:
 
 x = raw_input(Type in your first number:)
 
 y = raw_input(Multiply your first number by:)
 
 try:
 
 ans = int(x) * int(y)
 
 print (ans)
 
 try:
 
 ans = float(x) * float(y)
 
 print (ans)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 except OverflowError, err:
 
 print (Number too large)
 
 #division math function
 
 if type == division:
 
 x = raw_input(Type in your first number:)
 
 y = raw_input(Divide your first number by:)
 
 try:
 
 ans = float(x) / float(y)
 
 print (ans)
 
 except ZeroDivisionError, err:
 
 print (Can't divide by zero)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 except OverflowError, err:
 
 print (Number too large)
 
 #subtraction math function
 
 if type == subtraction:
 
 x = raw_input(Type in your first number:)
 
 y = raw_input(Subtract your first number by:)
 
 try:
 
 ans = float(x) - float(y)
 
 print (ans)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 #addition math function
 
 if type == addition:
 
 x = raw_input(Type in your first number:)
 
 y = raw_input(Add your first number by:)
 
 try:
 
 ans = float(x) + float(y)
 
 print (ans)
 
 except ValueError, err:
 
 try:
 
 ans = int(x) + int(y)
 
 print (ans)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 except OverflowError, err:
 
 print (Number too large)
 
 #square root math function
 
 if type == square root:
 
 x = raw_input(Type in your number:)
 
 try:
 
 y = float(x)
 
 z = math.sqrt(y)
 
 print (z)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 except OverflowError, err:
 
 print (Number too large)
 
 
 
 #to the power of... math function
 
 if type == power:
 
 x = raw_input(Type in your number:)
 
 y = raw_input(Multiply your first number by the power 
 of:)
 
 try:
 
 ans = float(x) ** float(y)
 
 print (ans)
 
 except OverflowError, err:
 
 print (Number too large)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 #break the math loop
 
 if type == main:
 
 run = 1
 
 #absolute value math function
 
 if type == absolute value:
 
 try:
 
 x = float(raw_input(Type in your number:))
 
 y = math.fabs(x)
 
 print (y)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 if function == random number:
 
 try:
 
 x = int(raw_input(Minimum number:))
 
 y = int(raw_input(Maximum number:))
 
 num = random.randint(x, y)
 
 print (num)
 
 except ValueError, err:
 
 print (Not a valid number)
 
 if function == games:
 
 games = 0
 
 while games == 0:
 
 gamechoice = raw_input(What game do you want to play:)
 
 if gamechoice == guess the number:
 
 run = 0
 
 while run == 0:
 
 print (I am thinking of a number between 1 and 20)

Re: Else statement executing when it shouldnt

On Sunday, January 20, 2013 8:52:12 PM UTC-8, Chris Angelico wrote:
 On Mon, Jan 21, 2013 at 3:40 PM, eli m techgeek...@gmail.com wrote:
 
  an else statement is running when it shouldnt be. It is on the last line. 
  Whenever i am in the math or game function, when i type in main, it goes 
  back to the start of the program, but it also says not a valid function. I 
  am stumped!
 
 
 
 Check your indentation levels. I see a few things here that look odd:
 
 
 
  if function == help:
 
  while helpfunc == 0:
 
  if helpmain == main:
 
  else:
 
 
 
 What is the else meant to bind to? The innermost if? The 'if function
 
 == help'? It's currently binding to the while.
 
 
 
 Recommendation: Break this up! Your main loop is huge! It's way too
 
 easy to get lost in it. And while you're at it, consider unifying some
 
 of the similar blocks of code. The solution to both issues is simple:
 
 Use functions. Have you been taught about them yet?
 
 
 
 Also, side tip: Be honest about homework. I'm fairly sure that's what
 
 this is. :)
 
 
 
 ChrisA

Its not homework. It is a personal project.
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Re: Else statement executing when it shouldnt


On 01/20/2013 11:40 PM, eli m wrote:
an else statement is running  when it shouldnt be. It is on the last line. Whenever i am in the math 
or game function, when i type in main, it goes back to the start of the 
program, but it also says not a valid function. I am stumped!

 Here is my code:
 #Cmd
 #Created By Eli M.
 #import modules
 import random
 import math
 gtn = 0
 print (Type in help for a list of cmd functions)
 #initiate main loop
 cmd = 0
 while cmd == 0:
 #ask for input on function
 function = raw_input(Type in a function:)
 #start math loop
 if function == math:
 run = 0
 while run == 0:
 #ask for math operation
 type = raw_input(What math operation do you want to use?)
 if type == multiplication:
 x = raw_input(Type in your first number:)
 y = raw_input(Multiply your first number by:)
 try:
 ans = int(x) * int(y)
 print (ans)
 try:
 ans = float(x) * float(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #division math function
 if type == division:
 x = raw_input(Type in your first number:)
 y = raw_input(Divide your first number by:)
 try:
 ans = float(x) / float(y)
 print (ans)
 except ZeroDivisionError, err:
 print (Can't divide by zero)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #subtraction math function
 if type == subtraction:
 x = raw_input(Type in your first number:)
 y = raw_input(Subtract your first number by:)
 try:
 ans = float(x) - float(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 #addition math function
 if type == addition:
 x = raw_input(Type in your first number:)
 y = raw_input(Add your first number by:)
 try:
 ans = float(x) + float(y)
 print (ans)
 except ValueError, err:
 try:
 ans = int(x) + int(y)
 print (ans)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)
 #square root math function
 if type == square root:
 x = raw_input(Type in your number:)
 try:
 y = float(x)
 z = math.sqrt(y)
 print (z)
 except ValueError, err:
 print (Not a valid number)
 except OverflowError, err:
 print (Number too large)

 #to the power of... math function
 if type == power:
 x = raw_input(Type in your number:)
 y = raw_input(Multiply your first number by the power of:)
 try:
 ans = float(x) ** float(y)
 print (ans)
 except OverflowError, err:
 print (Number too large)
 except ValueError, err:
 print (Not a valid number)
 #break the math loop
 if type == main:
 run = 1
 #absolute value math function
 if type == absolute value:
 try:
 x = float(raw_input(Type in your number:))
 y = math.fabs(x)
 print (y)
 except ValueError, err:
 print (Not a valid number)
 if function == random number:
 try:
 x = int(raw_input(Minimum number:))
 y = int(raw_input(Maximum number:))
 num = random.randint(x, y)
 print (num)
 except ValueError, err:
 print (Not a valid number)
 if function == games:
 games = 0
 while games == 0:
 gamechoice = raw_input(What game do you want to play:)
 if gamechoice == guess the number:
 run = 0
 while run == 0:
 print (I am thinking of a number between 1 and 20)
 num = random.randint(1, 20)
 num = int(num)
 guesses = 0
 guessestaken = 0
 while guesses == 0:
 try:
 guess = raw_input(Your guess:)
 guess = int(guess)
 guessestaken = (guessestaken) + 1
 guessestaken = int(guessestaken)
 if guess == (num):
 print 'Correct! It took you', int(guessestaken), 'guesses!'
 playagain = raw_input(Do you want to play again?)
 if playagain == yes:
 guesses = 1
 if playagain == no:
 run = 1
 guesses = 1
 if guess  num:
 print (My number is lower)
 if guess  num:
 print (My number is higher)
 except TypeError, err:
 print (Not a valid number)
 if gamechoice == main:
 games = 1

 #help function
 if function == help:
 helpfunc = 0
 while helpfunc == 0:
 #show functions
 print (Functions:)
 print (Math: multiplication, division, subtraction, addition, square 
root, power, absolute value)

 print (Random Number)
 print (Games: Guess the number)
 helpmain = raw_input(Type in main to go back)
 if helpmain == main:
 #end helpfunction loop
 helpfunc = 1
 cmd = 0
 else:
 print (Not a valid function)


Your else is lined up with while, not with if.

 -m


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Re: Else statement executing when it shouldnt

2013-01-20 Thread René Klačan

Examples:

# else branch will be executed
i = 0
while i  5:
i += 1
else:
print('loop is over')


# else branch will be executed
i = 0
while i  5:
i += 1
if i == 7:
print('i == 7')
break
else:
print('loop is over')


# else branch wont be executed
i = 0
while i  5:
i += 1
if i == 3:
print('i == 3')
break
else:
print('loop is over')

On Mon, Jan 21, 2013 at 5:57 AM, eli m techgeek...@gmail.com wrote:

 On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
  You have to break while loop not to execute else branch
 
 
  Rene
 
 
 
 Can you explain in more detail please.
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Re: Else statement executing when it shouldnt

2013-01-20 Thread René Klačan

Examples:

# else branch will be executed
i = 0
while i  5:
i += 1
else:
print('loop is over')


# else branch will be executed
i = 0
while i  5:
i += 1
if i == 7:
print('i == 7')
break
else:
print('loop is over')


# else branch wont be executed
i = 0
while i  5:
i += 1
if i == 3:
print('i == 3')
break
else:
print('loop is over')

On Mon, Jan 21, 2013 at 5:57 AM, eli m techgeek...@gmail.com wrote:

 On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
  You have to break while loop not to execute else branch
 
 
  Rene
 
 
 
 Can you explain in more detail please.
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Re: To make a method or attribute private

On Jan 21, 2:46 pm, Chris Angelico ros...@gmail.com wrote:
 These aren't proofs that something doesn't exist, they're proofs that
 trying to enforce privacy is bound to fail

But if you can't enforce it, can you really say it exists?

Semantics, they are fun! I feel another PyWart post coming on...
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Re: Else statement executing when it shouldnt

On Jan 21, 2:59 pm, eli m techgeek...@gmail.com wrote:
 Its lined up. It got messed up when i copied the code into the post.

Sorry, we're not going to take your word for it. Reduce it to the
minimal amount of code that reproduces your error and post that.
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Re: Else statement executing when it shouldnt

On Jan 21, 2:40 pm, eli m techgeek...@gmail.com wrote:
 an else statement is running when it shouldnt be. It is
 on the last line. Whenever i am in the math or game
 function, when i type in main, it goes back to the start
 of the program, but it also says not a valid function.
 I am stumped!

Here is your code with the irrelevancy stripped away:

function = raw_input(Type in a function:)
#start math loop
if function == math:
#math code
if function == random number:
#random code
if function == games:
#games code
if function == help:
#help code
else:
print (Not a valid function)

Say you enter 'math'. It passes the first condition, so runs the math
code.
It then fails on the next 3 conditions, the last of which has an else,
so if you type _anything_ other than 'help', you'll see Not a valid
function.

Easy answer, use `elif` (else if) instead of else for the subsequent
tests:

if function == math:
#math code
elif function == random number:
#random code
elif function == games:
#games code
elif function == help:
#help code
else:
print (Not a valid function)

Better answer: read up on real functions, and look into dictionary
dispatch:

def f_math():
   #math code

def f_random_number():
   #random code

etc

function_dispatcher = {
'math': f_math,
'random number': f_random_number,
etc
}

   while cmd == 0:
   function_name = raw_input(Type in a function:)
   if function_name in function_dispatcher:
   function_dispatcher[function_name]()
   else:
   print(Not a valid function)

To have your functions break out of the loop, use a `global` variable
or pass a context object into each function to allow them to set
`cmd`.
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Re: Else statement executing when it shouldnt

On Jan 21, 2:54 pm, eli m techgeek...@gmail.com wrote:
 hint: Use the comments in the code to find out where my error is.

Pro-tip: when people you're asking for help tell you how you can make
it easier for them to help you, a snide response isn't the correct
approach.
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Re: Else statement executing when it shouldnt


On 01/20/2013 11:59 PM, eli m wrote:






 Your else is lined up with while, not with if.



 -m





 --

 Lark's Tongue Guide to Python: http://lightbird.net/larks/



 When a friend succeeds, I die a little. Gore Vidal
 Its lined up. It got messed up when i copied the code into the post.


I would recommend using while True: and break vs. while var: as you
have. In most cases while True: works better, especially in case of long
and/or nested 'while' loops, as you have.

'while True' blocks have two advantages: 1. you can break the loop at
any location and 2. when looking at the code, you can tell on which
condition it breaks by looking at the break line.

Even more importantly, break it up into a few functions. The code as you
have it is too hard to work with and to debug.

It's hard to tell what your 'else' is lined up to, or whether some other
lines are mis-aligned, as well.

Generally, try to avoid making a loop if it's 20+ lines; if there are
nested loops, it makes things even worse. Compare:

if something:
while True:
 if not process(): break

def process():
 [... 20 lines that loop ...]
 [ return None to break the loop ]

Now this is really clear, because just by looking at the first three
lines, I know what the loop is supposed to do (process something), that
it continues looping until it returns a false value; when looking at
the function body I don't need to care which block it aligns to, I
already know the entire function body is in the while loop.

HTH, -m



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terrible, as we see in the maniac, the miser, the drunkard or the ape.
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Re: Forcing Python to detect DocumentRoot

2013-01-20 Thread Ferrous Cranus

Τη Σάββατο, 19 Ιανουαρίου 2013 10:01:15 μ.μ. UTC+2, ο χρήστης Piet van Oostrum
έγραψε:
Ferrous Cranus nikos.gr...@gmail.com writes:

This is addon domain's counter.py snippet tried to load an image mail.png
and failed because it cant see past its document root

# render html template and print it

data = f.read()

counter = '''center

a href=mailto:supp...@superhost.gr; img
src=/data/images/mail.png /a

table border=2 cellpadding=2 bgcolor=black

tdfont color=lime Αριθμός Επισκεπτών /td

tdfont color=cyan %d /td''' % hits[0]

While from within the same counter.py file

# open html template file

f = open( '/home/nikos/public_html/test.txt' )

opens OK the page file which is also past addons domain's document root

Can you help counter.py to load the image? Why does it fail to load it?
Python can have access to ANY filesystempath , no matter from what folder
counter.py script runs from. Correct?

That piece of code is not opening the image file. It just issues the URL

for the image file. The file will then be loaded by the browser in a new

request. The image should be at

/home/nikos/public_html/data/images/mail.png

Yes the image is this and is located at that folder.

/home/nikos/public_html/cgi-bin/counter.py

that has embedded this line:

a href=mailto:supp...@superhost.gr; img src=/data/images/mail.png /a

can open the file normally as seen if you visit http://superhost.gr

P.S. I don't understand what you mean by addon domain.

While

/home/nikos/public_html/cafebar-idea.gr/cgi-bin/counter.py

that has also embedded this line:

a href=mailto:supp...@superhost.gr; img src=/data/images/mail.png /a

cannnot open the file normally.

And the questions iw WHY since python script can open ANY filesystempath
file the user has access too.
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Re: Uniquely identifying each every html template

2013-01-20 Thread Ferrous Cranus

Τη Σάββατο, 19 Ιανουαρίου 2013 11:32:41 μ.μ. UTC+2, ο χρήστης Dennis Lee Bieber 
έγραψε:
 On Sat, 19 Jan 2013 00:39:44 -0800 (PST), Ferrous Cranus
 
 nikos.gr...@gmail.com declaimed the following in
 
 gmane.comp.python.general:
 
  We need to find a way so even IF:
 
  
 
  (filepath gets modified  file content's gets modified) simultaneously the 
  counter will STILL retains it's value.
 
 
 
   The only viable solution the /I/ can visualize is one in which any
 
 operation ON the template file MUST ALSO operate on the counter... That
 
 is; you only operate on the templates using a front-end application that
 
 automatically links the counter information every time...
 
 -- 
 
   Wulfraed Dennis Lee Bieber AF6VN
 
 wlfr...@ix.netcom.comHTTP://wlfraed.home.netcom.com/

CANNOT BE DONE because every html templates has been written by different 
methods.

dramweaver
joomla
notepad++
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Re: Uniquely identifying each every html template

2013-01-20 Thread Ferrous Cranus

Τη Σάββατο, 19 Ιανουαρίου 2013 11:00:15 π.μ. UTC+2, ο χρήστης Dave Angel έγραψε:
On 01/19/2013 03:39 AM, Ferrous Cranus wrote:

Τη Σάββατο, 19 Ιανουαρίου 2013 12:09:28 π.μ. UTC+2, ο χρήστης Dave Angel
έγραψε:

I don't understand the problem. A trivial Python script could scan

through all the files in the directory, checking which ones are missing

the identifier, and rewriting the file with the identifier added.

So, since you didn't come to that conclusion, there must be some other

reason you don't want to edit the files. Is it that the real sources

are elsewhere (e.g. Dreamweaver), and whenever one recompiles those

sources, these files get replaced (without identifiers)?

Exactly. Files get modified/updates thus the embedded identifier will be
missing each time. So, relying on embedding code to html template content
is not practical.

If that's the case, then I figure you have about 3 choices:

1) use the file path as your key, instead of requiring a number

No, i cannot, because it would mess things at a later time on when i for
example:

1. mv name.html othername.html (document's filename altered)

2. mv name.html /subfolder/name.html (document's filepath altered)

Hence, new database counters will be created for each of the above actions,
therefore i will be having 2 counters for the same file, and the latter one
will start from a zero value.

Pros: If the file's contents gets updated, that won't affect the counter.

Cons: If filepath is altered, then duplicity will happen.

2) use a hash of the page (eg. md5) as your key. of course this could

mean that you get a new value whenever the page is updated. That's good

in many situations, but you don't give enough information to know if

that's desirable for you or not.

That sounds nice! A hash is a mathematical algorithm that produce a unique
number after analyzing each file's contents? But then again what if the
html templated gets updated? That update action will create a new hash for
the file, hence another counter will be created for the same file, same end
result as (1) solution.

Pros: If filepath is altered, that won't affect the counter.

Cons: If file's contents gets updated the, then duplicity will happen.

3) Keep an external list of filenames, and their associated id numbers.

The database would be a good place to store such a list, in a separate
table.

I did not understand that solution.

We need to find a way so even IF:

(filepath gets modified file content's gets modified) simultaneously the
counter will STILL retains it's value.

You don't yet have a programming problem, you have a specification

problem. Somehow, you want a file to be considered the same even when

it's moved, renamed and/or modified. So all files are the same, and you

only need one id.

Don't pick a mechanism until you have an self-consistent spec.

I do have the specification.

An .html page must retain its database counter value even if its:

(renamed moved contents altered)

[original attributes of the file]:

filename: index.html
filepath: /home/nikos/public_html/
contents: html Hello /html

[get modified to]:

filename: index2.html
filepath: /home/nikos/public_html/folder/subfolder/
contents: html Hello, people /html

The file is still the same, even though its attributes got modified.
We want counter.py script to still be able to identify the .html page, hence
its counter value in order to get increased properly.
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Re: Uniquely identifying each every html template

On Mon, Jan 21, 2013 at 6:08 PM, Ferrous Cranus nikos.gr...@gmail.com wrote:
 An .html page must retain its database counter value even if its:

 (renamed  moved  contents altered)

Then you either need to tag them in some external way, or have some
kind of tracking operation - for instance, if you require that all
renames/moves be done through a script, that script can update its
pointer. Otherwise, you need magic, and lots of it.

ChrisA
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Re: ANN: Python training text movies

2013-01-20 Thread rusi

On Jan 13, 12:08 pm, Mitya Sirenef msire...@lightbird.net wrote:
 Sure: they play back a list of instructions on use of string methods and
 list comprehensions along with demonstration in a mock-up of the
 interpreter with a different display effect for commands typed into (and
 printed out by) the interpeter. The speed can be changed and the
 playback can be paused.

Hi Mitya.
What do you use for making these 'text-movies'?
[Asking after some googling]
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[issue16998] Lost updates with multiprocessing.Value

2013-01-20 Thread Jens Lechtenboerger


Jens Lechtenboerger added the comment:

 Loads and stores are both atomic.  But += is made up of two operations, a 
 load followed by a store, and the lock is dropped between the two.

I see.  Then this is a documentation bug.  The examples in the documentation 
use such non-thread-safe assignments (combined with the statement These shared 
objects will be process and thread safe.).

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[issue4153] Unicode HOWTO up to date?

2013-01-20 Thread Roundup Robot


Roundup Robot added the comment:

New changeset 260a9afd999a by Ezio Melotti in branch '3.2':
#4153: update the Unicode howto.
http://hg.python.org/cpython/rev/260a9afd999a

New changeset 572ca3d35c2f by Ezio Melotti in branch '3.3':
#4153: merge with 3.2.
http://hg.python.org/cpython/rev/572ca3d35c2f

New changeset 034e1e076c77 by Ezio Melotti in branch 'default':
#4153: merge with 3.3.
http://hg.python.org/cpython/rev/034e1e076c77

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[issue4153] Unicode HOWTO up to date?


Ezio Melotti added the comment:

I committed the attached patch with some minor modifications, but there are 
still comments that should be addressed on Rietveld.

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[issue17002] html.entities ImportError in distutils2/pypi/simple.py on Python2.7

2013-01-20 Thread Cillian de Róiste


New submission from Cillian de Róiste:

I guess it should be wrapped in a try, except:

try:
from html.entities import name2codepoint
except ImportError:
from htmlentitydefs import name2codepoint

This works locally

Here's a sample traceback:

Traceback (most recent call last):
  File python2nix.py, line 119, in module
egg_release = pypi.get_release(egg['name'] + '==' + version)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 201, in get_release
releases = self.get_releases(predicate, prefer_final)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 189, in get_releases
self._process_index_page(predicate.name)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 75, in wrapped
return func(self, *args, **kwargs)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 397, in _process_index_page
self._process_url(url, name)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 320, in _process_url
for link, is_download in link_matcher(f.read().decode(), base_url):
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 362, in _simple_link_matcher
url = self._get_full_url(match.group(1), base_url)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 349, in _get_full_url
return urlparse.urljoin(base_url, self._htmldecode(url))
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 469, in _htmldecode
return ENTITY_SUB(self._decode_entity, text)
  File 
/nix/var/nix/profiles/plone/lib/python2.7/site-packages/Distutils2-1.0a4-py2.7.egg/distutils2/pypi/simple.py,
 line 463, in _decode_entity
from html.entities import name2codepoint
ImportError: No module named html.entities

--
assignee: eric.araujo
components: Distutils2
messages: 180285
nosy: alexis, eric.araujo, goibhniu, tarek
priority: normal
severity: normal
status: open
title: html.entities ImportError in distutils2/pypi/simple.py on Python2.7
type: crash
versions: Python 2.7

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[issue16998] Lost updates with multiprocessing.Value

2013-01-20 Thread Richard Oudkerk


Richard Oudkerk added the comment:

 I see.  Then this is a documentation bug.  The examples in the 
 documentation use such non-thread-safe assignments (combined with the 
 statement These shared objects will be process and thread safe.).

Are you talking about this documentation:

  If lock is True (the default) then a new lock object is created to 
  synchronize access to the value. If lock is a Lock or RLock object then 
  that will be used to synchronize access to the value. If lock is False 
  then access to the returned object will not be automatically protected 
  by a lock, so it will not necessarily be “process-safe”.

It only says that accesses are synchronized.  The problem is that you were 
assuming that += involves a single access -- but that is not how python works.

Where in the examples is there non-process-safe access?  (Note that waiting 
for the only process which modifies a value to terminate using join() will 
prevent races.)

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[issue17002] html.entities ImportError in distutils2/pypi/simple.py on Python2.7


Ezio Melotti added the comment:

htmlentitydefs was renamed to html.entities in Python 3.
If this is supposed to run with Python 2 it should use the former, otherwise 
the latter (unless it has the same codebase on both).

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[issue1159051] Handle corrupted gzip files with unexpected EOF


Serhiy Storchaka added the comment:

Here is an updated patch addressing Nadeem Vawda's comments. Thank you.

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[issue1159051] Handle corrupted gzip files with unexpected EOF

2013-01-20 Thread Nadeem Vawda


Nadeem Vawda added the comment:

The updated patch looks good to me.

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[issue16997] subtests

2013-01-20 Thread Arfrever Frehtes Taifersar Arahesis


Changes by Arfrever Frehtes Taifersar Arahesis arfrever@gmail.com:


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[issue13598] string.Formatter doesn't support empty curly braces {}

2013-01-20 Thread Vinay Sajip


Vinay Sajip added the comment:

Looking at Phil Elson's patch:

I didn't see a test case relating to the example in his comment, namely

f.format({0:{}}, 'foo', 5)

Did I miss it? The documentation also needs to be updated.

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[issue17001] Make uuid.UUID use functools.total_ordering

2013-01-20 Thread Ramchandra Apte


Changes by Ramchandra Apte maniandra...@gmail.com:


Removed file: http://bugs.python.org/file28794/issue-v2.patch

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[issue17001] Make uuid.UUID use functools.total_ordering

2013-01-20 Thread Ramchandra Apte


Ramchandra Apte added the comment:

Oh darn, I included another bugs changes in it.
I unlinked the v2 patch and have attached issue17001-v2.patch

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[issue17001] Make uuid.UUID use functools.total_ordering


Serhiy Storchaka added the comment:

Except for mistakenly included functional.rst changes, the patch looks good for 
me.

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[issue16557] PEP 380 isn't reflected in the Functional Programming HOWTO

2013-01-20 Thread Roundup Robot


Roundup Robot added the comment:

New changeset e0de6e6e992e by Ezio Melotti in branch '3.3':
#16557: update functional howto -- return value is valid after PEP 380.  
Initial patch by Ramchandra Apte.
http://hg.python.org/cpython/rev/e0de6e6e992e

New changeset 81b2a30da853 by Ezio Melotti in branch 'default':
#16557: merge with 3.3.
http://hg.python.org/cpython/rev/81b2a30da853

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[issue16557] PEP 380 isn't reflected in the Functional Programming HOWTO


Ezio Melotti added the comment:

Fixed, thanks for the report and the patch!

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[issue16042] smtplib: unlimited readline() from connection


Christian Heimes added the comment:

Yes, I'm going to work on this issue for 2.7 and 3.3.

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[issue16041] poplib: unlimited readline() from connection


Changes by Christian Heimes li...@cheimes.de:


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[issue16040] nntplib: unlimited readline() from connection


Changes by Christian Heimes li...@cheimes.de:


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[issue16039] imaplib: unlimited readline() from connection


Changes by Christian Heimes li...@cheimes.de:


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[issue16038] ftplib: unlimited readline() from connection


Changes by Christian Heimes li...@cheimes.de:


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[issue16037] httplib: header parsing is not delimited


Changes by Christian Heimes li...@cheimes.de:


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[issue16043] xmlrpc: gzip_decode has unlimited read()


Christian Heimes added the comment:

The attached patch adds a limitation to xmlrpclib.gzip_decode().

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Added file: http://bugs.python.org/file28796/xmlrpc_gzip_27.patch

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[issue1470548] Bugfix for #1470540 (XMLGenerator cannot output UTF-16)


Serhiy Storchaka added the comment:

Patch updated. Now I get rid of __del__ to prevent hanging on reference cicles 
as Antoine suggested on IRC. Added test for check that XMLGenerator doesn't 
close the file passed as argument.

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[issue17003] Unification of read() and readline() argument names


New submission from Serhiy Storchaka:

read() and readline() optional parameter which limit the amount of read data 
has different names in different classes. All this classes mimic (less or more) 
io classes. Keyword parameter name is a part of method specification. Therefore 
it will be good made all read() arguments names the same and all readline() 
arguments names the same (and be consistent with documentation and C 
implementation). At least we should choose most consistent name for new 
implementations. If existent C implementation of some method doesn't support 
keyword argument (all _io classes) or argument names in C and Python 
implementations are different then we are free to change this name without 
breaking existing code.

For example, read()'s parameter named as:

n in _pyio, zipfile, and io documentation;
size in gzip, bz2, imaplib, tarfile, codecs, mailbox;
len in ssl;
wtd or totalwtd in binhex;
amt in http/client;
chars in codecs;
buffersize in os.

readline()'s parameter named as:

limit in _pyio, zipfile, and io documentation;
size in gzip, bz2, codecs, mailbox, lzma.

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serhiy.storchaka, stutzbach
priority: normal
severity: normal
status: open
title: Unification of read() and readline() argument names
type: enhancement

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[issue7353] cporting docs recommend using Include/intobject.h, which was removed in 3.1?


Christian Heimes added the comment:

Go ahead!

The intobject header file used to make porting to Python 3 easier. Nowadays 
it's no longer required.

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[issue17003] Unification of read() and readline() argument names


Serhiy Storchaka added the comment:

Looks as size is most common parameter name for both read() and readline(). 
First, we can change the io documentation and _pyio signatures (it shouldn't 
break anything because _io doesn't support keyword arguments).

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[issue16273] f.tell() returning negative number on Windows build

2013-01-20 Thread Catalin Iacob


Catalin Iacob added the comment:

Could it be that Raymond's file had Unix line endings?

I tried to reproduce this, picked a file on my disk and indeed I got a negative 
number, but that file has Unix line endings. This is documented at 
http://docs.python.org/2/library/stdtypes.html#file.tell so probably there's 
nothing to do then.

As for Armin's report in msg180145, even though it's not intuitive, this 
matches ftell's behavior on Windows, as documented in the Remarks section of 
http://msdn.microsoft.com/en-us/library/0ys3hc0b%28v=vs.100%29.aspx. The tell() 
method on fileobjects is explicitly documented as matching ftell behavior: 
Return the file’s current position, like stdio‘s ftell(). So even though it's 
not intuitive at all, it's probably better to leave it as is. tell() returns 
the intuitive non zero position when opening with 'a' on Python3 and on Python 
2.7 when using io.open so it's fixed for the future anyway.

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[issue17003] Unification of read() and readline() argument names

2013-01-20 Thread Antoine Pitrou


Antoine Pitrou added the comment:

n is the best choice IMO. size is ok too, although it may be confused with 
the byte-size of the result.

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[issue17003] Unification of read() and readline() argument names


Serhiy Storchaka added the comment:

Here is a patch which changes name of optional parameter of read(), read1(), 
peek(), and readline() methods to most common name size in the documentation 
and _pyio module. truncate() in _pyio fixed to conform with documentation. This 
changes are safe.

There is open question about readlines(). It's optional parameter named as:

hint in _pyio and the documentation;
size in bz2;
sizehint in codecs and mailbox.

--
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stage:  - patch review
Added file: http://bugs.python.org/file28798/io_parameter_names.patch

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[issue17003] Unification of read() and readline() argument names


Serhiy Storchaka added the comment:

 n is the best choice IMO.

Unfortunately most stdlib modules vote for size.

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[issue15881] multiprocessing 'NoneType' object is not callable

2013-01-20 Thread Tres Seaver


Tres Seaver added the comment:

I can reproduce the bug against the 2.7 tip.

Reviewing the 2.7 patch:

- The 2.7 tip has 'Misc/ACKS' instead of 'Doc/ACKS.txt'.

- In 'Misc/ACKS', the line adding 'Chris McDonough' should add it in alpha 
order.

- The remainder of the patch looks correct, and applies cleanly to the tip of 
the 2.7 branch.

- After applying the patch to the 2.7 tip, I can no longer reproduce the bug.

- After applying the patch, the full test suite ('./python -m test.testall 
-j3') passes all tests.

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[issue16042] smtplib: unlimited readline() from connection


Serhiy Storchaka added the comment:

mock_socket violates readline() contract. It can return more than size bytes, 
and this can break SMTP.readline().

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[issue17004] Expand zipimport to include other compression methods


New submission from Raymond Hettinger:

Only a little of the existing logic is tied to the zipfile format.  Consider 
adding support for xz, tar, tar.gz, tar.bz2, etc.

In particular, xz has better compression, resulting in both space savings and 
faster load times.

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title: Expand zipimport to include other compression methods
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[issue17004] Expand zipimport to include other compression methods

2013-01-20 Thread Brian Curtin


Changes by Brian Curtin br...@python.org:


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[issue17002] html.entities ImportError in distutils2/pypi/simple.py on Python2.7

2013-01-20 Thread Éric Araujo


Éric Araujo added the comment:

Good call.  All function-level imports are avoided in d2 unless absolutely 
necessary, and this one slipped through the cracks.  distutils2 went from 
Python 2 to 3 to 2 and 3 again, so these things happen (and it’s one of the 
reasons why I’ve always insisted on trying to keep as much history as possible 
in one repo).

Will fix, as even though d2 will not continue to live as one monolithic 
project, the pypi submodule will certainly be extracted in a smaller lib 
reusable by other tools.

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[issue8745] zipimport is a bit slow


Changes by Serhiy Storchaka storch...@gmail.com:


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[issue16507] Patch selectmodule.c to support WSAPoll on Windows


Guido van Rossum added the comment:

Oh, it needs a new patch -- the patch fails to apply in the 3.4
(default) branch.

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[issue17004] Expand zipimport to include other compression methods


Serhiy Storchaka added the comment:

tar.* is not a good choice because it doesn't allow random access. Bare tar 
better than zip only in case when you need to save additional file attributes 
(Unix file access mode, times, owner, group, links). ZIP format supports all 
this too, but not zipfile module yet.

Adding bz2 or lzma compression to ZIP file shouldn't be too hard.

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[issue17004] Expand zipimport to include other compression methods


Serhiy Storchaka added the comment:

Here are some tests.

time 7z a -tzip -mx=0 python-0.zip $(find Lib -type f -name '*.py') /dev/null
time 7z a -tzip python.zip $(find Lib -type f -name '*.py') /dev/null
time 7z a -tzip -mx=9 python-9.zip $(find Lib -type f -name '*.py') /dev/null
time 7z a -tzip -mm=bzip2 python-bzip2.zip $(find Lib -type f -name '*.py') 
/dev/null
time 7z a -tzip -mm=bzip2 -mx=9 python-bzip2-9.zip $(find Lib -type f -name 
'*.py') /dev/null
time 7z a -tzip -mm=lzma python-lzma.zip $(find Lib -type f -name '*.py') 
/dev/null
time 7z a -tzip -mm=lzma -mx=9 python-lzma-9.zip $(find Lib -type f -name 
'*.py') /dev/null
time 7z t python-0.zip /dev/null
time 7z t python.zip /dev/null
time 7z t python-9.zip /dev/null
time 7z t python-bzip2.zip /dev/null
time 7z t python-bzip2-9.zip /dev/null
time 7z t python-lzma /dev/null
time 7z t python-lzma.zip /dev/null
time 7z t python-lzma-9.zip /dev/null
wc -c python*.zip

Results:

 pack* unpack   size
 time   time(MB)
store 0.50.2   19.42
deflate 60.44.59
deflate-max400.44.52
bzip2   62.14.45
bzip2-max  792.04.39
lzma   370.74.42
lzma-max   620.74.39

*) For pack time I take user time because 7-zip well parallelize deflate and 
bzip2 compression.

As you can see, a size difference between maximal compression with different 
methods only 3%. lzma decompress almost twice slower then deflate, and bzip2 
decompress 5 times slower. Python files are too small to get benefit from 
advanced compression.

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[issue8745] zipimport is a bit slow


Serhiy Storchaka added the comment:

Sorry, Brian. Raymond is an initiator of issue17004.

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[issue13405] Add DTrace probes

2013-01-20 Thread Trent Nelson


Changes by Trent Nelson tr...@snakebite.org:


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[issue17004] Expand zipimport to include other compression methods

2013-01-20 Thread Antoine Pitrou


Antoine Pitrou added the comment:

 Here are some tests.

I think you want to put pyc files in the zip file as well.

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[issue17004] Expand zipimport to include other compression methods


Raymond Hettinger added the comment:

xz will likely be the best win -- it is purported to compress smaller than bz2 
while retaining the decompression speed of zip.

As Antoine says, the usual practice is to add py, pyc, and pyo files to the 
compressed library; otherwise, there is an added cost with Python tries to 
write a missing pyc/pyo file.

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[issue16507] Patch selectmodule.c to support WSAPoll on Windows


Guido van Rossum added the comment:

Here's a new version of the patch.  (Will test on Windows next.)

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[issue17001] Make uuid.UUID use functools.total_ordering


Raymond Hettinger added the comment:

I recommend against this patch.  The code generated by functools.total_ordering 
is less efficient than the existing code and it doesn't handle the 
NotImplemented logic very well.

total_ordering() is a shortcut, not a best practice.

--
nosy: +rhettinger

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[issue16507] Patch selectmodule.c to support WSAPoll on Windows


Guido van Rossum added the comment:

That compiles (after hacking the line endings).  One Tulip test fails, 
PollEventLooptests.testSockClientFail.  But that's probably because the 
PollSelector class hasn't been adjusted for Windows yet (need to dig this out 
of the Pollster code that was deleted when switching to neologix's Selector).

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[issue16507] Patch selectmodule.c to support WSAPoll on Windows


Guido van Rossum added the comment:

That compiles (after hacking the line endings).  One Tulip test fails, 
PollEventLooptests.testSockClientFail.  But that's probably because the 
PollSelector class hasn't been adjusted for Windows yet (need to dig this out 
of the Pollster code that was deleted when switching to neologix's Selector).

--

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[issue17005] Add a topological sort algorithm


New submission from Raymond Hettinger:

I suggest adding a topological sort algorithm to the standard library.

In addition to being a fundamental algorithm, it is immediately useful in 
demonstrating how the MRO computation works and for pure Python implementations 
of MRO logic.   IIRC, the pgen code was also expressed in pure Python for the 
same reason.

I've attached a first-draft of the algorithm and an alternative that only 
implements a topological merge.  This is just an early draft and there are a 
number of open points:

* which module to put it in
* a better implementation may be possible (perhaps using fewer dictionaries and 
sets).

--
files: mro_merge.py
messages: 180319
nosy: rhettinger
priority: low
severity: normal
status: open
title: Add a topological sort algorithm
type: enhancement
versions: Python 3.4
Added file: http://bugs.python.org/file28800/mro_merge.py

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[issue15050] Python 3.2.3 fail to make