date:20110819

Hi Josh,
thanks for the reply. I am no expert so please bear with me:
I thought that the {32} was supposed to match the previous expression 32 
times?

So how can i have all matches accessible to me?

matt



On Thursday, August 18, 2011, Josh Benner wrote:
 On Thu, Aug 18, 2011 at 4:03 PM, Matt Funk matze...@gmail.com wrote:
  Hi guys,
  
  thanks for the suggestions. I had tried the white space before as well
  (to no
  avail). So here is the expression i am using (based on suggestions), but
  still
  no success:
  
  instance_linetype_pattern_str =\
  
 r'(([-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+))?\s+){32}(.+)'
  
  instance_linetype_pattern = re.compile(instance_linetype_pattern_str)
  results = instance_linetype_pattern.findall(line)
  print results: ; print results
  
  
  The match i get is:
  results:
  [('2.199000e+01 ', '2.199000', '.199000', 'e+01', ': (instance:
  0)\t:\tsome description')]
  
  
  btw: The line to be matched (given below) is ONE line. There are no line
  breaks (even though my email client adds them).
  
  
  matt
 
 If a group matches multiple times, only the last match is accessible.  The
 matches returned represent the inner groupings of the last match found.
 
 JB-)

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Re: How to convert a list of strings into a list of variables

2011-08-19 Thread noydb

Thanks to all for your responses!  Good lessons.  I implemented
something like what Jerry Hill suggested (dictionary), which works
well for my purposes.  The list of strings that is being passed into
this code is also provided by something I wrote so I do trust what is
being sent.  Might use what AB suggested down the line, as tool
expands.  Thanks!
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Re: Help with regular expression in python

2011-08-19 Thread Jason Friedman

 Hi Josh,
 thanks for the reply. I am no expert so please bear with me:
 I thought that the {32} was supposed to match the previous expression 32
 times?

 So how can i have all matches accessible to me?

$ python
Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 data
'1.002000e+01 2.037000e+01 2.128000e+01 1.908000e+01 1.871000e+01
1.914000e+01 2.007000e+01 1.664000e+01 2.204000e+01 2.109000e+01
2.209000e+01 2.376000e+01 2.158000e+01 2.177000e+01 2.152000e+01
2.267000e+01 1.084000e+01 1.671000e+01 1.888000e+01 1.854000e+01
2.064000e+01 2.00e+01 2.20e+01 2.139000e+01 2.137000e+01
2.178000e+01 2.179000e+01 2.123000e+01 2.201000e+01 2.15e+01
2.15e+01 2.199000e+01 : (instance: 0)   :   some
description'
 import re
 re.findall(r\d\.\d+e\+\d+, data)
['1.002000e+01', '2.037000e+01', '2.128000e+01', '1.908000e+01',
'1.871000e+01', '1.914000e+01', '2.007000e+01', '1.664000e+01',
'2.204000e+01', '2.109000e+01', '2.209000e+01', '2.376000e+01',
'2.158000e+01', '2.177000e+01', '2.152000e+01', '2.267000e+01',
'1.084000e+01', '1.671000e+01', '1.888000e+01', '1.854000e+01',
'2.064000e+01', '2.00e+01', '2.20e+01', '2.139000e+01',
'2.137000e+01', '2.178000e+01', '2.179000e+01', '2.123000e+01',
'2.201000e+01', '2.15e+01', '2.15e+01', '2.199000e+01']
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How to make statements running in strictly sequential fashion like in an interactive shell

2011-08-19 Thread lzlu123

I have an instrument that has a RS232 type serial comm port and I need
to connect to and control. I use Python 3.2 in Windows XP, plus
pySerial module. I have a problem when I execute a script consisting
of statements that open the comm port, configure it, write strings to
and receive strings from it. Thoese strings aer either commands
pertinent to the instrument (control) or responses from the instrument
(response).

When those statements are executed in a python interpreter
interactively (at ), I get what I expect and the results are good
and correct. However, when I execute the script, either being invoked
within the interpreter or run file, I don’t get what I want. The
statements in the script is the same as what I use in the interactive
interpreter.

Why do I get the strange behavior and how can I change the script to
make it to behave like in interactive interpreter?

--script---
def read(comport):

wrt_str=b'movt 3000'+b'\r\n'
ret_str=comport.write(wrt_str)

wrt_str=b'scan'+b'\r\n'
ret_str=comport.write(wrt_str)

rsp_str=comport.readlines() #1

wrt_str=b'hllo'+b'\r\n'
ret_str=comport.write(wrt_str)

rsp_str=comport.readlines()#2
--

The problem is with the lines above with ###. In interactive mode,
there is about 1 second delay at #1, and 9 seonds delay at #2. I get
correct responses there. However, if I execute the script above, there
is no delay at all and I get incorrect results (garbage). I set the
read timeout to 0 in comm port set up, as

comport.timeout=0
So the comport should be in blocking mode if it waits for the end of
line or end of file.

I tried many things, like exec (execfile in 2.7), but at no avail.

I have an update to the original post I made a few days ago. I think I
know what the problem is and want to know if anyone has a solution:

After putting print and time.sleep(delay) after every statement, I
found when the script is running, it appears going around the pyserial
statement, such as comport.write(..) or comport.readlines(...)
while the pyserial command is executing (appearing as waiting and
busying doing some thing, you know serial port is slow). So for
example, when I exec all statements in a python interactive shell, I
am not able to type and run a new statement if the previous one is not
returned. Let's ay, if comport.readlines() is not returning, I can't
type and run the next comport.write(...) statemtn. However, in a
script that is running, if the comport.readlines() is busy reading,
the next statement is running, if the next statement happens to be a
comport.write() which will abort the reading.

Is there any way to force the python script to behave like running
exactly sequentially?
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Re: How to print non-printable chars??

2011-08-19 Thread jmfauth

On 18 août, 22:44, coldpizza vri...@gmail.com wrote:


 ...

 In a web/html environment or in broken ascii-only consoles like the
 one on windows ...

C:\Users\Jean-Michelecho 'Cet œuf de Lætitia coûte un €uro'
'Cet œuf de Lætitia coûte un €uro'

C:\Users\Jean-Michelc:\Python27\python
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit
(Intel)] on win32
Type help, copyright, credits or license for more information.
 print 'Cet œuf de Lætitia coûte un €uro'
Cet œuf de Lætitia coûte un €uro
 import sys
 u = unicode('Cet œuf de Lætitia coûte un €uro', sys.stdin.encoding)
 print u.encode(sys.stdout.encoding)
Cet œuf de Lætitia coûte un €uro


C:\Users\Jean-Michelc:\Python32\python
Python 3.2.1 (default, Jul 10 2011, 21:51:15) [MSC v.1500 32 bit
(Intel)] on win32
Type help, copyright, credits or license for more information.
 print('Cet œuf de Lætitia coûte un €uro')
Cet œuf de Lætitia coûte un €uro


PS Cet œuf de Lætitia coûte un €uro -
   This Lætitia's egg costs one €uro'

PS2 ñ does not require special attention.

PS3 To the original question: This not a *coding* issue, it is a
character *representation* question.

jmf
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Re: Execute script from ipython

2011-08-19 Thread Chris Rebert

On Fri, Aug 19, 2011 at 6:00 AM, Johan Ekh ekh.jo...@gmail.com wrote:
 Hi all,
 I have a script myscript.py located in /usr/local/bin on my linux box.
 I can execute it in ipython with

 run /usr/local/bin/myscript.py

 but not with

 run myscript.py

 even though /usr/local/bin is in my $PATH and in my $PYTHONPATH.

 What should I do to correct this?

Given that %run takes a filename and not a module name, I doubt
PYTHONPATH matters. ipython's docs for %run don't seem to indicate
that a search of any kind is performed. So, I'd say you have to either
pass a valid absolute or relative path to myscript.py, or run
myscript.py from bash instead of ipython.

Changing your script's shebang line to ipython might also work
(haven't tried it myself). Or you could try patching ipython's run()
function to add this search feature you desire.

Cheers,
Chris
--
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Re: Help with regular expression in python

Hi,
thanks for the suggestion. I guess i had found another way around the
problem as well. But i really wanted to match the line exactly and i
wanted to know why it doesn't work. That is less for the purpose of
getting the thing to work but more because it greatly annoys me off that
i can't figure out why it doesn't work. I.e. why the expression is not
matches {32} times. I just don't get it.

anyway, thanks though
matt

On 8/19/2011 8:41 AM, Jason Friedman wrote:
 Hi Josh,
 thanks for the reply. I am no expert so please bear with me:
 I thought that the {32} was supposed to match the previous expression 32
 times?

 So how can i have all matches accessible to me?
 $ python
 Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
 [GCC 4.4.3] on linux2
 Type help, copyright, credits or license for more information.
 data
 '1.002000e+01 2.037000e+01 2.128000e+01 1.908000e+01 1.871000e+01
 1.914000e+01 2.007000e+01 1.664000e+01 2.204000e+01 2.109000e+01
 2.209000e+01 2.376000e+01 2.158000e+01 2.177000e+01 2.152000e+01
 2.267000e+01 1.084000e+01 1.671000e+01 1.888000e+01 1.854000e+01
 2.064000e+01 2.00e+01 2.20e+01 2.139000e+01 2.137000e+01
 2.178000e+01 2.179000e+01 2.123000e+01 2.201000e+01 2.15e+01
 2.15e+01 2.199000e+01 : (instance: 0)   :   some
 description'
 import re
 re.findall(r\d\.\d+e\+\d+, data)
 ['1.002000e+01', '2.037000e+01', '2.128000e+01', '1.908000e+01',
 '1.871000e+01', '1.914000e+01', '2.007000e+01', '1.664000e+01',
 '2.204000e+01', '2.109000e+01', '2.209000e+01', '2.376000e+01',
 '2.158000e+01', '2.177000e+01', '2.152000e+01', '2.267000e+01',
 '1.084000e+01', '1.671000e+01', '1.888000e+01', '1.854000e+01',
 '2.064000e+01', '2.00e+01', '2.20e+01', '2.139000e+01',
 '2.137000e+01', '2.178000e+01', '2.179000e+01', '2.123000e+01',
 '2.201000e+01', '2.15e+01', '2.15e+01', '2.199000e+01']

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Replacement for the shelve module?

2011-08-19 Thread Forafo San

Folks,
What might be a good replacement for the shelve module, but one that
can handle a few gigs of data. I'm doing some calculations on daily
stock prices and the result is a nested list like:

[[date_1, floating result 1],
 [date_2, floating result 2],
...
 [date_n, floating result n]]

However, there are about 5,000 lists like that, one for each stock
symbol. Using the shelve module I could easily save them to a file
( myshelvefile['symbol_1') = symbol_1_list) and likewise retrieve the
data. But shelve is deprecated AND when a lot of data is written
shelve was acting weird (refusing to write, filesizes reported with an
ls did not make sense, etc.).

Thanks in advance for your suggestions.
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Re: Replacement for the shelve module?

2011-08-19 Thread Ken Watford

On Fri, Aug 19, 2011 at 11:31 AM, Forafo San ppv.g...@gmail.com wrote:
 Folks,
 What might be a good replacement for the shelve module, but one that
 can handle a few gigs of data. I'm doing some calculations on daily
 stock prices and the result is a nested list like:

For what you're doing, I would give PyTables a try.
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Re: Help with regular expression in python

2011-08-19 Thread jmfauth

On 19 août, 17:20, Matt Funk matze...@gmail.com wrote:
 Hi,
 thanks for the suggestion. I guess i had found another way around the
 problem as well. But i really wanted to match the line exactly and i
 wanted to know why it doesn't work. That is less for the purpose of
 getting the thing to work but more because it greatly annoys me off that
 i can't figure out why it doesn't work. I.e. why the expression is not
 matches {32} times. I just don't get it.


re is not always the right tool to be used.
Without more precisions:

 s = '2.201000e+01 2.15e+01 2.15e+01\
...  : (instance: 0)   :   some description'
 s
2.201000e+01 2.15e+01 2.15e+01 : (instance: 0)   :
some description
 s[:s.find(':')]
2.201000e+01 2.15e+01 2.15e+01
 s[:s.find(':')].split()
['2.201000e+01', '2.15e+01', '2.15e+01']



jmf
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HTML client sctript

Hi Python users,

I am maintaining a website written with Python CGI scripts. To make sure the 
website is working well, 
I would like to have a script which automatically uses this website and 
checks it's output everyday. It
would be better if this script runs from the clients' side.

Could any one suggest any Python modules, articles, tutorials, ect. that might 
be helpful?

Thank you.

- Yingjie







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Re: Replacement for the shelve module?

2011-08-19 Thread Thomas Jollans

On 19/08/11 17:31, Forafo San wrote:
 Folks,
 What might be a good replacement for the shelve module, but one that
 can handle a few gigs of data. I'm doing some calculations on daily
 stock prices and the result is a nested list like:
 
 [[date_1, floating result 1],
  [date_2, floating result 2],
 ...
  [date_n, floating result n]]
 
 However, there are about 5,000 lists like that, one for each stock
 symbol. Using the shelve module I could easily save them to a file
 ( myshelvefile['symbol_1') = symbol_1_list) and likewise retrieve the
 data. But shelve is deprecated AND when a lot of data is written
 shelve was acting weird (refusing to write, filesizes reported with an
 ls did not make sense, etc.).
 
 Thanks in advance for your suggestions.

Firstly, since when is shelve deprecated? Shouldn't there be a
deprecation warning on http://docs.python.org/dev/library/shelve.html ?

If you want to keep your current approach of having an object containing
all the data for each symbol, you will have to think about how to
serialise the data, as well as how to store the documents/objects
individually. For the serialisation, you can use pickle (as shelve does)
or JSON (probably better because it's easier to edit directly, and
therefore easier to debug).
To store these documents, you could use a huge pickle'd Python
dictionary (bad idea), a UNIX database (dbm module, anydbm in Python2;
this is what shelve uses), or simple the file system: one file per
serialised object.

Looking at your use case, however, I think what you really should use is
a SQL database. SQLite is part of Python and will do the job nicely.
Just use a single table with three columns: symbol, date, value.

Thomas
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Re: Help with regular expression in python

2011-08-19 Thread Alain Ketterlin

Matt Funk matze...@gmail.com writes:

 thanks for the suggestion. I guess i had found another way around the
 problem as well. But i really wanted to match the line exactly and i
 wanted to know why it doesn't work. That is less for the purpose of
 getting the thing to work but more because it greatly annoys me off that
 i can't figure out why it doesn't work. I.e. why the expression is not
 matches {32} times. I just don't get it.

Because a line is not 32 times a number, it is a number followed by 31
times a space followed by a number. Using Jason's regexp, you can
build the regexp step by step:

number = r\d\.\d+e\+\d+
numbersequence = r%s( %s){31} % (number,number)

There are better ways to build your regexp, but I think this one is
convenient to answer your question. You still have to append what will
match the end of the line.

-- Alain.

P/S: please do not top-post

 $ python
 Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
 [GCC 4.4.3] on linux2
 Type help, copyright, credits or license for more information.
 data
 '1.002000e+01 2.037000e+01 2.128000e+01 1.908000e+01 1.871000e+01
 1.914000e+01 2.007000e+01 1.664000e+01 2.204000e+01 2.109000e+01
 2.209000e+01 2.376000e+01 2.158000e+01 2.177000e+01 2.152000e+01
 2.267000e+01 1.084000e+01 1.671000e+01 1.888000e+01 1.854000e+01
 2.064000e+01 2.00e+01 2.20e+01 2.139000e+01 2.137000e+01
 2.178000e+01 2.179000e+01 2.123000e+01 2.201000e+01 2.15e+01
 2.15e+01 2.199000e+01 : (instance: 0)   :   some
 description'
 import re
 re.findall(r\d\.\d+e\+\d+, data)
 ['1.002000e+01', '2.037000e+01', '2.128000e+01', '1.908000e+01',
 '1.871000e+01', '1.914000e+01', '2.007000e+01', '1.664000e+01',
 '2.204000e+01', '2.109000e+01', '2.209000e+01', '2.376000e+01',
 '2.158000e+01', '2.177000e+01', '2.152000e+01', '2.267000e+01',
 '1.084000e+01', '1.671000e+01', '1.888000e+01', '1.854000e+01',
 '2.064000e+01', '2.00e+01', '2.20e+01', '2.139000e+01',
 '2.137000e+01', '2.178000e+01', '2.179000e+01', '2.123000e+01',
 '2.201000e+01', '2.15e+01', '2.15e+01', '2.199000e+01']
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Re: HTML client sctript

2011-08-19 Thread John Gordon

In mailman.224.1313769546.27778.python-l...@python.org Yingjie Lin 
yingjie@mssm.edu writes:

 Hi Python users,

 I am maintaining a website written with Python CGI scripts. To make
 sure the website is working well, I would like to have a script which
 automatically uses this website and checks it's output everyday. It
 would be better if this script runs from the clients' side.

 Could any one suggest any Python modules, articles, tutorials, ect. that
 might be helpful?

Mechanize seems like what you want.  It's built on top of urllib2.

http://wwwsearch.sourceforge.net/mechanize/

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: Replacement for the shelve module?

2011-08-19 Thread Forafo San

On Aug 19, 11:54 am, Thomas Jollans t...@jollybox.de wrote:
 On 19/08/11 17:31, Forafo San wrote:









  Folks,
  What might be a good replacement for the shelve module, but one that
  can handle a few gigs of data. I'm doing some calculations on daily
  stock prices and the result is a nested list like:

  [[date_1, floating result 1],
   [date_2, floating result 2],
  ...
   [date_n, floating result n]]

  However, there are about 5,000 lists like that, one for each stock
  symbol. Using the shelve module I could easily save them to a file
  ( myshelvefile['symbol_1') = symbol_1_list) and likewise retrieve the
  data. But shelve is deprecated AND when a lot of data is written
  shelve was acting weird (refusing to write, filesizes reported with an
  ls did not make sense, etc.).

  Thanks in advance for your suggestions.

 Firstly, since when is shelve deprecated? Shouldn't there be a
 deprecation warning onhttp://docs.python.org/dev/library/shelve.html?

 If you want to keep your current approach of having an object containing
 all the data for each symbol, you will have to think about how to
 serialise the data, as well as how to store the documents/objects
 individually. For the serialisation, you can use pickle (as shelve does)
 or JSON (probably better because it's easier to edit directly, and
 therefore easier to debug).
 To store these documents, you could use a huge pickle'd Python
 dictionary (bad idea), a UNIX database (dbm module, anydbm in Python2;
 this is what shelve uses), or simple the file system: one file per
 serialised object.

 Looking at your use case, however, I think what you really should use is
 a SQL database. SQLite is part of Python and will do the job nicely.
 Just use a single table with three columns: symbol, date, value.

 Thomas

Sorry. There is no indication that shelve is deprecated. I was using
it on a FreeBSD system and it turns out that the bsddb module is
deprecated and confused it with the shelve module.

Thanks Ken and Thomas for your suggestions -- I will play around with
both and pick one.
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Re: HTML client sctript

2011-08-19 Thread Chris Rebert

On Fri, Aug 19, 2011 at 8:08 AM, Yingjie Lin yingjie@mssm.edu wrote:
 Hi Python users,

 I am maintaining a website written with Python CGI scripts. To make sure the 
 website is working well,
 I would like to have a script which automatically uses this website and 
 checks it's output everyday. It
 would be better if this script runs from the clients' side.

 Could any one suggest any Python modules, articles, tutorials, ect. that 
 might be helpful?

Selenium:
http://seleniumhq.org/

Cheers,
Chris
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Help on PyQt4 QProcess

2011-08-19 Thread Edgar Fuentes

Dear friends,

I need execute an external program from a gui using PyQt4, to avoid
that hang the main thread, i must connect the signal finished(int)
of a QProcess to work properly.

for example, why this program don't work?

   from PyQt4.QtCore import QProcess
   pro = QProcess() # create QProcess object
   pro.connect(pro, SIGNAL('started()'), lambda
x=started:print(x))# connect
   pro.connect(pro, SIGNAL(finished(int)), lambda
x=finished:print(x))
   pro.start('python',['hello.py'])# star hello.py program
(contain print(hello world!))
   timeout = -1
   pro.waitForFinished(timeout)
   print(pro.readAllStandardOutput().data())

output:

   started
   0
   b'hello world!\n'

see that not emit the signal finished(int)

I'm using Python 3.2 and PyQt 4.8.4 under winxp 32bit.


best regards,
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Re: Replacement for the shelve module?

2011-08-19 Thread Miki Tebeka

You might check one of many binary encoders (like Avro, Thrift ...).
The other option is to use a database, sqlite3 is pretty fast (if you schema is 
fixed). Otherwise you can look at some NoSQL ones (like MongoDB).
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Re: Help with regular expression in python

On Friday, August 19, 2011, Alain Ketterlin wrote:
 Matt Funk matze...@gmail.com writes:
  thanks for the suggestion. I guess i had found another way around the
  problem as well. But i really wanted to match the line exactly and i
  wanted to know why it doesn't work. That is less for the purpose of
  getting the thing to work but more because it greatly annoys me off that
  i can't figure out why it doesn't work. I.e. why the expression is not
  matches {32} times. I just don't get it.
 
 Because a line is not 32 times a number, it is a number followed by 31
 times a space followed by a number. Using Jason's regexp, you can
 build the regexp step by step:
 
 number = r\d\.\d+e\+\d+
 numbersequence = r%s( %s){31} % (number,number)
That didn't work either. Using the (modified (where the (.+) matches the end of 
the line)) expression as:

number = r\d\.\d+e\+\d+
numbersequence = r%s( %s){31}(.+) % (number,number)
instance_linetype_pattern = re.compile(numbersequence)

The results obtained are:
results: 
[(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
so this matches the last number plus the string at the end of the line, but no 
retaining the previous numbers.

Anyway, i think at this point i will go another route. Not sure where the 
issues lies at this point.

thanks for all the help
matt


 
 There are better ways to build your regexp, but I think this one is
 convenient to answer your question. You still have to append what will
 match the end of the line.
 
 -- Alain.
 
 P/S: please do not top-post
 
  $ python
  Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
  [GCC 4.4.3] on linux2
  Type help, copyright, credits or license for more information.
  
  data
  
  '1.002000e+01 2.037000e+01 2.128000e+01 1.908000e+01 1.871000e+01
  1.914000e+01 2.007000e+01 1.664000e+01 2.204000e+01 2.109000e+01
  2.209000e+01 2.376000e+01 2.158000e+01 2.177000e+01 2.152000e+01
  2.267000e+01 1.084000e+01 1.671000e+01 1.888000e+01 1.854000e+01
  2.064000e+01 2.00e+01 2.20e+01 2.139000e+01 2.137000e+01
  2.178000e+01 2.179000e+01 2.123000e+01 2.201000e+01 2.15e+01
  2.15e+01 2.199000e+01 : (instance: 0)   :   some
  description'
  
  import re
  re.findall(r\d\.\d+e\+\d+, data)
  
  ['1.002000e+01', '2.037000e+01', '2.128000e+01', '1.908000e+01',
  '1.871000e+01', '1.914000e+01', '2.007000e+01', '1.664000e+01',
  '2.204000e+01', '2.109000e+01', '2.209000e+01', '2.376000e+01',
  '2.158000e+01', '2.177000e+01', '2.152000e+01', '2.267000e+01',
  '1.084000e+01', '1.671000e+01', '1.888000e+01', '1.854000e+01',
  '2.064000e+01', '2.00e+01', '2.20e+01', '2.139000e+01',
  '2.137000e+01', '2.178000e+01', '2.179000e+01', '2.123000e+01',
  '2.201000e+01', '2.15e+01', '2.15e+01', '2.199000e+01']

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Re: Replacement for the shelve module?

2011-08-19 Thread Robert Kern


On 8/19/11 10:49 AM, Ken Watford wrote:

On Fri, Aug 19, 2011 at 11:31 AM, Forafo Sanppv.g...@gmail.com  wrote:

Folks,
What might be a good replacement for the shelve module, but one that
can handle a few gigs of data. I'm doing some calculations on daily
stock prices and the result is a nested list like:


For what you're doing, I would give PyTables a try.


For a few gigs of stock price data, this is what I use. Much better than SQLite 
for that amount of data.


--
Robert Kern

I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth.
  -- Umberto Eco

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Re: Help on PyQt4 QProcess

2011-08-19 Thread Phil Thompson

On Fri, 19 Aug 2011 10:15:20 -0700 (PDT), Edgar Fuentes
fuente...@gmail.com wrote:
 Dear friends,
 
 I need execute an external program from a gui using PyQt4, to avoid
 that hang the main thread, i must connect the signal finished(int)
 of a QProcess to work properly.
 
 for example, why this program don't work?
 
from PyQt4.QtCore import QProcess
pro = QProcess() # create QProcess object
pro.connect(pro, SIGNAL('started()'), lambda
 x=started:print(x))# connect
pro.connect(pro, SIGNAL(finished(int)), lambda
 x=finished:print(x))
pro.start('python',['hello.py'])# star hello.py program
 (contain print(hello world!))
timeout = -1
pro.waitForFinished(timeout)
print(pro.readAllStandardOutput().data())
 
 output:
 
started
0
b'hello world!\n'
 
 see that not emit the signal finished(int)

Yes it is, and your lambda slot is printing 0 which is the return code
of the process.

Phil
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Re: Help with regular expression in python

2011-08-19 Thread jmfauth

On 19 août, 19:33, Matt Funk matze...@gmail.com wrote:

 The results obtained are:
 results:
 [(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
 so this matches the last number plus the string at the end of the line, but no
 retaining the previous numbers.

 Anyway, i think at this point i will go another route. Not sure where the
 issues lies at this point.



Seen on this list:

And always keep this in mind:
'Some people, when confronted with a problem, think I know, I'll use
regular expressions.  Now they have two problems.'
--Jamie Zawinski, comp.lang.emacs


I proposed a solution which seems to corresponds to your problem
if it were better formulated...

jmf

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try... except with unknown error types

Hi Python users,

I have been using try...except statements in the situations where I can expect 
a certain type of errors might occur. 
But  sometimes I don't exactly know the possible error types, or sometimes I 
just can't spell the error types correctly. 
For example, 

try:
response = urlopen(urljoin(uri1, uri2))
except urllib2.HTTPError:
print URL does not exist!

Though urllib2.HTTPError is the error type reported by Python, Python doesn't 
recognize it as an error type name. 
I tried using HTTPError alone too, but that's not recognized either.

Does anyone know what error type I should put after the except statement? or 
even better: is there a way not to specify
the error types? Thank you.


- Yingjie







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Re: HTML client sctript

Hi John and Chris,

Thanks for the help. 

I looked at both and think that mechanize suits my needs better, 
since it simply needs a python script and doesn't depend on Firefox.

Yingjie 

 From: John Gordon gor...@panix.com
 Mechanize seems like what you want.  It's built on top of 
 urllib2.http://wwwsearch.sourceforge.net/mechanize/
 

 From: Chris Rebert c...@rebertia.com
 Selenium:http://seleniumhq.org/
 

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Re: try... except with unknown error types

2011-08-19 Thread John Gordon

In mailman.230.1313780957.27778.python-l...@python.org Yingjie Lin 
yingjie@mssm.edu writes:

 try:
   response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
   print URL does not exist!

 Though urllib2.HTTPError is the error type reported by Python, Python
 doesn't recognize it as an error type name. I tried using HTTPError
 alone too, but that's not recognized either.

Have you imported urllib2 in your code?

 Does anyone know what error type I should put after the except
 statement? or even better: is there a way not to specify the error
 types? Thank you.

You can catch all exceptions by catching the base class Exception:

  try:
some_method()
  except Exception, e:
print some error happened, here is the explanation:
print str(e)

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: try... except with unknown error types

2011-08-19 Thread xDog Walker

On Friday 2011 August 19 12:09, Yingjie Lin wrote:
 Hi Python users,

 I have been using try...except statements in the situations where I can
 expect a certain type of errors might occur. But  sometimes I don't exactly
 know the possible error types, or sometimes I just can't spell the error
 types correctly. For example,

 try:
   response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
   print URL does not exist!

 Though urllib2.HTTPError is the error type reported by Python, Python
 doesn't recognize it as an error type name. I tried using HTTPError alone
 too, but that's not recognized either.

 Does anyone know what error type I should put after the except statement?
 or even better: is there a way not to specify the error types? Thank you.

You probably need to import urllib2 before you can use urllib2.HTTPError.

Otherwise, you can try using the base class:

except Exception, e:

-- 
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Re: try... except with unknown error types

2011-08-19 Thread Zero Piraeus

:

On 19 August 2011 15:09, Yingjie Lin yingjie@mssm.edu wrote:

 I have been using try...except statements in the situations where I can 
 expect a certain type of errors might occur.
 But  sometimes I don't exactly know the possible error types, or sometimes I 
 just can't spell the error types correctly.
 For example,

 try:
response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
print URL does not exist!

 Though urllib2.HTTPError is the error type reported by Python, Python 
 doesn't recognize it as an error type name.
 I tried using HTTPError alone too, but that's not recognized either.

 Does anyone know what error type I should put after the except statement? or 
 even better: is there a way not to specify
 the error types? Thank you.

You should always specify the error type, so that your error-handling
code won't attempt to handle an error it didn't anticipate and cause
even more problems.

In this case, I think it's just that you haven't imported HTTPError
into your namespace - if you do, it works:

 from urllib2 import urlopen, HTTPError
 try:
...   response = urlopen(http://google.com/invalid;)
... except HTTPError:
...   print URL does not exist!
...
URL does not exist!


Alternatively:

 import urllib2
 try:
...   response = urllib2.urlopen(http://google.com/invalid;)
... except urllib2.HTTPError:
...   print URL does not exist!
...
URL does not exist!


A careful look at the difference between these two ought to make it
clear what's going on.

 -[]z.
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Re: try... except with unknown error types

Hi Zero,

I see! This is very helpful. Thank you.

- Yingjie







On Aug 19, 2011, at 3:30 PM, Zero Piraeus wrote:

 :
 
 On 19 August 2011 15:09, Yingjie Lin yingjie@mssm.edu wrote:
 
 I have been using try...except statements in the situations where I can 
 expect a certain type of errors might occur.
 But  sometimes I don't exactly know the possible error types, or sometimes I 
 just can't spell the error types correctly.
 For example,
 
 try:
response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
print URL does not exist!
 
 Though urllib2.HTTPError is the error type reported by Python, Python 
 doesn't recognize it as an error type name.
 I tried using HTTPError alone too, but that's not recognized either.
 
 Does anyone know what error type I should put after the except statement? or 
 even better: is there a way not to specify
 the error types? Thank you.
 
 You should always specify the error type, so that your error-handling
 code won't attempt to handle an error it didn't anticipate and cause
 even more problems.
 
 In this case, I think it's just that you haven't imported HTTPError
 into your namespace - if you do, it works:
 
 from urllib2 import urlopen, HTTPError
 try:
 ...   response = urlopen(http://google.com/invalid;)
 ... except HTTPError:
 ...   print URL does not exist!
 ...
 URL does not exist!
 
 
 Alternatively:
 
 import urllib2
 try:
 ...   response = urllib2.urlopen(http://google.com/invalid;)
 ... except urllib2.HTTPError:
 ...   print URL does not exist!
 ...
 URL does not exist!
 
 
 A careful look at the difference between these two ought to make it
 clear what's going on.
 
 -[]z.

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Re: 'super' object has no attribute 'setitem'

2011-08-19 Thread Bob Vandy

I'm pretty sure I'd actually read the first 2 links you point to, but the
difference between __setattr__ and __setitem__ still never registered with
me -- perhaps partly because even the discussion of __setattr__ discusses
adding an entry to the  *dictionary* of instance attributes.

*MANY* thanks for your help!






On Thu, Aug 18, 2011 at 10:07 PM, Eric Snow ericsnowcurren...@gmail.comwrote:

 On Thu, Aug 18, 2011 at 7:44 PM, luvspython srehtva...@gmail.com wrote:
  I'm using Python 2.7 and the code below fails at the 'super' statement
  in the __setitem__ function in the HistoryKeeper class.  The error is:
'super' object has no attribute '_setitem__'
 
  Can anyone please tell me why and how to fix it?   (I've googled
  endlessly and I don't see the problem.)
 
  [The code will seem silly as it is, because it's pared down to show
  the example.  The goal is that multiple classes, like the Vehicle
  class below, will inherit HistoryKeeper.  History keeper overloads
  __setitem__ and will eventually keep a running history every time an
  attribute of any of the inheriting classes is changed.]
 
  Thanks in advance 
 
 
  class HistoryKeeper(object):
 def __init__(self, args):
 for arg, value in args.items():
 if arg != 'self':
 self.__setitem__(arg, value)
 
 def __setitem__(self, item, value):
 super(HistoryKeeper, self).__setitem__(item, value)
 
 
  class Vehicle(HistoryKeeper):
 def __init__(self, tag, make, model):
 args = locals()
 super(Vehicle, self).__init__(args)
 
 
  if __name__ == __main__:
 car = Vehicle('TAG123', 'FORD', 'Model A')
 print car.make

 Did you mean to use __setattr__ instead?  object, the base class of
 HistoryKeeper, does not have a __setitem__ method, hence the
 AttributeError.  super() is a proxy for the next class in the MRO,
 typically the base class of your class.

 Keep in mind that obj.tag = TAG123 is equivalent to
 obj.__setattr__(tag, TAG123).  However, obj[tag] = TAG123
 is equivalent to obj.__setitem__(tag, TAG123).

 see:

 http://docs.python.org/reference/datamodel.html#object.__setattr__
 http://docs.python.org/reference/datamodel.html#object.__setitem__
 http://docs.python.org/library/functions.html#super

 -eric

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Re: Help on PyQt4 QProcess

2011-08-19 Thread Edgar Fuentes

On Aug 19, 1:56 pm, Phil Thompson p...@riverbankcomputing.com wrote:
 On Fri, 19 Aug 2011 10:15:20 -0700 (PDT), Edgar Fuentes









 fuente...@gmail.com wrote:
  Dear friends,

  I need execute an external program from a gui using PyQt4, to avoid
  that hang the main thread, i must connect the signal finished(int)
  of a QProcess to work properly.

  for example, why this program don't work?

     from PyQt4.QtCore import QProcess
     pro = QProcess() # create QProcess object
     pro.connect(pro, SIGNAL('started()'), lambda
  x=started:print(x))        # connect
     pro.connect(pro, SIGNAL(finished(int)), lambda
  x=finished:print(x))
     pro.start('python',['hello.py'])        # star hello.py program
  (contain print(hello world!))
     timeout = -1
     pro.waitForFinished(timeout)
     print(pro.readAllStandardOutput().data())

  output:

     started
     0
     b'hello world!\n'

  see that not emit the signal finished(int)

 Yes it is, and your lambda slot is printing 0 which is the return code
 of the process.

 Phil

Ok, but the output should be:

started
b'hello world!\n'
finished

no?.

thanks Phil
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Re: Help with regular expression in python

2011-08-19 Thread ru...@yahoo.com

On 08/19/2011 11:33 AM, Matt Funk wrote:
 On Friday, August 19, 2011, Alain Ketterlin wrote:
 Matt Funk matze...@gmail.com writes:
  thanks for the suggestion. I guess i had found another way around the
  problem as well. But i really wanted to match the line exactly and i
  wanted to know why it doesn't work. That is less for the purpose of
  getting the thing to work but more because it greatly annoys me off that
  i can't figure out why it doesn't work. I.e. why the expression is not
  matches {32} times. I just don't get it.

 Because a line is not 32 times a number, it is a number followed by 31
 times a space followed by a number. Using Jason's regexp, you can
 build the regexp step by step:

 number = r\d\.\d+e\+\d+
 numbersequence = r%s( %s){31} % (number,number)
 That didn't work either. Using the (modified (where the (.+) matches the end 
 of
 the line)) expression as:

 number = r\d\.\d+e\+\d+
 numbersequence = r%s( %s){31}(.+) % (number,number)
 instance_linetype_pattern = re.compile(numbersequence)

 The results obtained are:
 results:
 [(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
 so this matches the last number plus the string at the end of the line, but no
 retaining the previous numbers.

The secret is buried very unobtrusively in the re docs,
where it has caught me out in the past.  Specifically
in the docs for re.group():

  If a group is contained in a part of the pattern that
  matched multiple times, the last match is returned.

In addition to the findall solution someone else
posted, another thing you could do is to explicitly
express the groups in your re:

  number = r\d\.\d+e\+\d+
  groups = (r( %s) % number)*31
  numbersequence = r%s%s(.+) % (number,groups)
  ...
  results = match_object.group(range(1,33))

Or (what I would probably do), simply match the
whole string of numbers and pull it apart later:

  number = r\d\.\d+e\+\d+
  numbersequence = r(%s(?: %s){31})(.+) % (number,number)
  results = (match_object.group(1)).split()

[none of this code is tested but should be close
enough to convey the general idea.]
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Re: try... except with unknown error types

John Gordon wrote:

 In mailman.230.1313780957.27778.python-l...@python.org Yingjie Lin
 yingjie@mssm.edu writes:
 
 try:
 response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
 print URL does not exist!
 
 Though urllib2.HTTPError is the error type reported by Python, Python
 doesn't recognize it as an error type name. I tried using HTTPError
 alone too, but that's not recognized either.
 
 Have you imported urllib2 in your code?

Good question.

If Python doesn't recognize it as an error type name, there is a reason
for that. Exceptions are exactly the same as every other name:

 foo.spam
Traceback (most recent call last):
  File stdin, line 1, in module
NameError: name 'foo' is not defined
 urllib2.HTTPError
Traceback (most recent call last):
  File stdin, line 1, in module
NameError: name 'urllib2' is not defined



 Does anyone know what error type I should put after the except
 statement? or even better: is there a way not to specify the error
 types? Thank you.
 
 You can catch all exceptions by catching the base class Exception:

Except that is nearly always poor advice, because it catches too much: it
hides bugs in code, as well as things which should be caught.

You should always catch the absolute minimum you need to catch.



-- 
Steven

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Re: Hot Girls are Looking for Sex

2011-08-19 Thread Matty Sarro

That's great - but do they program in python?

On Fri, Aug 19, 2011 at 2:38 PM, Sajjad Ahmad sajjad.ahmad...@gmail.com wrote:
 See All details on

 http://hotelandtourism9.blogspot.com/2011/08/indian-hotels-wall-st-effect.html

 .

 See All details on

 http://hotelandtourism9.blogspot.com/2011/08/indian-hotels-wall-st-effect.html

 .

 See All details on

 http://hotelandtourism9.blogspot.com/2011/08/indian-hotels-wall-st-effect.html

 .

 See All details on

 http://hotelandtourism9.blogspot.com/2011/08/indian-hotels-wall-st-effect.html

 .

 See All details on

 http://hotelandtourism9.blogspot.com/2011/08/indian-hotels-wall-st-effect.html

 .

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Re: Help with regular expression in python

2011-08-19 Thread Carl Banks

On Friday, August 19, 2011 10:33:49 AM UTC-7, Matt Funk wrote:
 number = r\d\.\d+e\+\d+
 numbersequence = r%s( %s){31}(.+) % (number,number)
 instance_linetype_pattern = re.compile(numbersequence)
 
 The results obtained are:
 results: 
 [(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
 so this matches the last number plus the string at the end of the line, but 
 no 
 retaining the previous numbers.
 
 Anyway, i think at this point i will go another route. Not sure where the 
 issues lies at this point.


I think the problem is that repeat counts don't actually repeat the groupings; 
they just repeat the matchings.  Take this expression:

r(\w+\s*){2}

This will match exactly two words separated by whitespace.  But the match 
result won't contain two groups; it'll only contain one group, and the value of 
that group will match only the very last thing repeated:

Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53) 
[GCC 4.5.2] on linux2
Type help, copyright, credits or license for more information.
 import re
 m = re.match(r(\w+\s*){2},abc def)
 m.group(1)
'def'

So you see, the regular expression is doing what you think it is, but the way 
it forms groups is not.


Just a little advice (I know you've found a different method, and that's good, 
this is for the general reader).

The functions re.findall and re.finditer could have helped here, they find all 
the matches in a string and let you iterate through them.  (findall returns the 
strings matched, and finditer returns the sequence of match objects.)  You 
could have done something like this:

row = [ float(x) for x in re.findall(r'\d+\.\d+e\+d+',line) ]

And regexp matching is often overkill for a particular problem; this may be of 
them.  line.split() could have been sufficient:

row = [ float(x) for x in line.split() ]

Of course, these solutions don't account for the case where you have lines, 
some of which aren't 32 floating-point numbers.  You need extra error handling 
for that, but you get the idea.


Carl Banks
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Re: try... except with unknown error types

2011-08-19 Thread John Gordon

In 4e4ec405$0$29994$c3e8da3$54964...@news.astraweb.com Steven D'Aprano 
steve+comp.lang.pyt...@pearwood.info writes:

  You can catch all exceptions by catching the base class Exception:

 Except that is nearly always poor advice, because it catches too much: it
 hides bugs in code, as well as things which should be caught.

 You should always catch the absolute minimum you need to catch.

I agree, but it did seem to be exactly what he was asking for.

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: Help on PyQt4 QProcess

2011-08-19 Thread Carl Banks

On Friday, August 19, 2011 12:55:40 PM UTC-7, Edgar Fuentes wrote:
 On Aug 19, 1:56 pm, Phil Thompson 
  wrote:
  On Fri, 19 Aug 2011 10:15:20 -0700 (PDT), Edgar Fuentes
  fuen...@gmail.com wrote:
   Dear friends,
 
   I need execute an external program from a gui using PyQt4, to avoid
   that hang the main thread, i must connect the signal finished(int)
   of a QProcess to work properly.
 
   for example, why this program don't work?
 
      from PyQt4.QtCore import QProcess
      pro = QProcess() # create QProcess object
      pro.connect(pro, SIGNAL('started()'), lambda
   x=started:print(x))        # connect
      pro.connect(pro, SIGNAL(finished(int)), lambda
   x=finished:print(x))
      pro.start('python',['hello.py'])        # star hello.py program
   (contain print(hello world!))
      timeout = -1
      pro.waitForFinished(timeout)
      print(pro.readAllStandardOutput().data())
 
   output:
 
      started
      0
      b'hello world!\n'
 
   see that not emit the signal finished(int)
 
  Yes it is, and your lambda slot is printing 0 which is the return code
  of the process.
 
  Phil
 
 Ok, but the output should be:
 
 started
 b'hello world!\n'
 finished
 
 no?.
 
 thanks Phil

Two issues.  First of all, your slot for the finished function does not have 
the correct prototype, and it's accidentally not throwing an exception because 
of your unnecessary use of default arguments.  Anyway, to fix that, try this:

pro.connect(pro, SIGNAL(finished(int)), lambda v, x=finished:print(x))

Notice that it adds an argument to the lambda (v) that accepts the int argument 
of the signal.  If you don't have that argument there, the int argument goes 
into x, which is why Python prints 0 instead of finished.

Second, processess run asynchrously, and because of line-buffering, IO can 
output asynchronously, and so there's no guarantee what order output occurs.  
You might try calling the python subprocess with the '-u' switch to force 
unbuffered IO, which might be enough to force synchronous output (depending on 
how signal/slot and subprocess semantics are implemented).


Carl Banks
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Re: Hot Girls are Looking for Sex

2011-08-19 Thread Philip Semanchuk


On Aug 19, 2011, at 4:17 PM, Matty Sarro wrote:

 That's great - but do they program in python?


Please don't repost URLs sent by a spammer. Only Google truly knows how its 
algorithm works, but the general consensus is that the more times Google sees a 
link repeated, the more credibility the link is given. By reposting links, you 
help the spammer.  



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Re: Replacement for the shelve module?

Forafo San wrote:

Folks,
What might be a good replacement for the shelve module, but one that
can handle a few gigs of data. I'm doing some calculations on daily
stock prices and the result is a nested list like:

[[date_1, floating result 1],
[date_2, floating result 2],
...
[date_n, floating result n]]

However, there are about 5,000 lists like that, one for each stock
symbol.

You might save some memory by using tuples rather than lists:

sys.getsizeof([01/01/2000, 123.456]) # On a 32-bit system.
40
sys.getsizeof((01/01/2000, 123.456))
32

By the way, you know that you should never, ever use floats for currency,
right?

http://vladzloteanu.wordpress.com/2010/01/11/why-you-shouldnt-use-float-for-currency-floating-point-issues-explained-for-ruby-and-ror/
http://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency

Using the shelve module I could easily save them to a file
( myshelvefile['symbol_1') = symbol_1_list) and likewise retrieve the
data. But shelve is deprecated

It certainly is not.

http://docs.python.org/library/shelve.html
http://docs.python.org/py3k/library/shelve.html

Not a word about it being deprecated in either Python 2.x or 3.x.

AND when a lot of data is written
shelve was acting weird (refusing to write, filesizes reported with an
ls did not make sense, etc.).

I would like to see this replicated. If it is true, that's a bug in shelve,
but I expect you're probably doing something wrong.

--
Steven

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Re: Help with regular expression in python

2011-08-19 Thread MRAB


On 19/08/2011 20:55, ru...@yahoo.com wrote:

On 08/19/2011 11:33 AM, Matt Funk wrote:

On Friday, August 19, 2011, Alain Ketterlin wrote:

Matt Funkmatze...@gmail.com  writes:

thanks for the suggestion. I guess i had found another way around the
problem as well. But i really wanted to match the line exactly and i
wanted to know why it doesn't work. That is less for the purpose of
getting the thing to work but more because it greatly annoys me off that
i can't figure out why it doesn't work. I.e. why the expression is not
matches {32} times. I just don't get it.


Because a line is not 32 times a number, it is a number followed by 31
times a space followed by a number. Using Jason's regexp, you can
build the regexp step by step:

number = r\d\.\d+e\+\d+
numbersequence = r%s( %s){31} % (number,number)

That didn't work either. Using the (modified (where the (.+) matches the end of
the line)) expression as:

number = r\d\.\d+e\+\d+
numbersequence = r%s( %s){31}(.+) % (number,number)
instance_linetype_pattern = re.compile(numbersequence)

The results obtained are:
results:
[(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
so this matches the last number plus the string at the end of the line, but no
retaining the previous numbers.


The secret is buried very unobtrusively in the re docs,
where it has caught me out in the past.  Specifically
in the docs for re.group():

   If a group is contained in a part of the pattern that
   matched multiple times, the last match is returned.


[snip]
There's a regex implementation on PyPI:

http://pypi.python.org/pypi/regex

which does support capturing all of the matches of a group.
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Stop quoting spam [was Re: Hot Girls ...]

Matty Sarro wrote:

 That's great - but do they program in python?

Thanks for that, I didn't see the spam the first time, but thanks to
your joke I saw it now! I really appreciate that, because I LOVE to have
spam sent to me, including all the URLs. An extra bonus is that when the
posting is archived on a couple of dozen websites, this will boost the
spammer's Google rankings.

Thanks heaps! Your joke was so worth it.

Not.



[spam deleted]


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Re: try... except with unknown error types

John Gordon wrote:

 In 4e4ec405$0$29994$c3e8da3$54964...@news.astraweb.com Steven D'Aprano
 steve+comp.lang.pyt...@pearwood.info writes:
 
  You can catch all exceptions by catching the base class Exception:
 
 Except that is nearly always poor advice, because it catches too much: it
 hides bugs in code, as well as things which should be caught.
 
 You should always catch the absolute minimum you need to catch.
 
 I agree, but it did seem to be exactly what he was asking for.

Sure, but if we're giving advice to somebody who is clearly a beginner
(doesn't even know how to deal with a simple NameError from failing to
import a module), it is our responsibility to teach *good* habits, not to
teach him to be a crap programmer.

Even if you don't think it's the ethical thing to do, consider that someday
you might be maintaining code written by the OP :)




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Re: Stop quoting spam [was Re: Hot Girls ...]

2011-08-19 Thread Rodrick Brown

It's not the end of the world calm down I thought it was quite funny for a 
friday joke! 

Sent from my iPhone

On Aug 19, 2011, at 4:43 PM, Steven D'Aprano 
steve+comp.lang.pyt...@pearwood.info wrote:

 Matty Sarro wrote:
 
 That's great - but do they program in python?
 
 Thanks for that, I didn't see the spam the first time, but thanks to
 your joke I saw it now! I really appreciate that, because I LOVE to have
 spam sent to me, including all the URLs. An extra bonus is that when the
 posting is archived on a couple of dozen websites, this will boost the
 spammer's Google rankings.
 
 Thanks heaps! Your joke was so worth it.
 
 Not.
 
 
 
 [spam deleted]
 
 
 -- 
 Steven
 
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Re: Stop quoting spam [was Re: Hot Girls ...]

2011-08-19 Thread Matty Sarro

It was a joke, no need to be a prick about it.

If you're that offended then spend the cycles fixing the damn list so it
stops having so much spam. You realize spam comes in almost constantly,
right? Enough that multiple tines over the past weeks there have been no
less than 3 threads about it.

If php, red hat, and perl can manage it for their lists, why not python? Is
that a statement about python programmers?

God forbid I try to make a joke. Grow up.
On Aug 19, 2011 4:46 PM, Steven Dapos;Aprano 
steve+comp.lang.pyt...@pearwood.info wrote:
 Matty Sarro wrote:

 That's great - but do they program in python?

 Thanks for that, I didn't see the spam the first time, but thanks to
 your joke I saw it now! I really appreciate that, because I LOVE to have
 spam sent to me, including all the URLs. An extra bonus is that when the
 posting is archived on a couple of dozen websites, this will boost the
 spammer's Google rankings.

 Thanks heaps! Your joke was so worth it.

 Not.



 [spam deleted]


 --
 Steven

 --
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Re: Stop quoting spam [was Re: Hot Girls ...]

2011-08-19 Thread Matty Sarro

Glad someone has a sense of humor :)

If one person smiled I consider it a success.
Happy weekend!
On Aug 19, 2011 5:12 PM, Rodrick Brown rodrick.br...@gmail.com wrote:
 It's not the end of the world calm down I thought it was quite funny for a
friday joke!

 Sent from my iPhone

 On Aug 19, 2011, at 4:43 PM, Steven D'Aprano 
steve+comp.lang.pyt...@pearwood.info wrote:

 Matty Sarro wrote:

 That's great - but do they program in python?

 Thanks for that, I didn't see the spam the first time, but thanks to
 your joke I saw it now! I really appreciate that, because I LOVE to
have
 spam sent to me, including all the URLs. An extra bonus is that when the
 posting is archived on a couple of dozen websites, this will boost the
 spammer's Google rankings.

 Thanks heaps! Your joke was so worth it.

 Not.



 [spam deleted]


 --
 Steven

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Re: Help with regular expression in python

On Friday, August 19, 2011, jmfauth wrote:
 On 19 août, 19:33, Matt Funk matze...@gmail.com wrote:
  The results obtained are:
  results:
  [(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
  so this matches the last number plus the string at the end of the line,
  but no retaining the previous numbers.
  
  Anyway, i think at this point i will go another route. Not sure where the
  issues lies at this point.
 
 Seen on this list:
 
 And always keep this in mind:
 'Some people, when confronted with a problem, think I know, I'll use
 regular expressions.  Now they have two problems.'
 --Jamie Zawinski, comp.lang.emacs
 
 
 I proposed a solution which seems to corresponds to your problem
 if it were better formulated...
Agreed, and i will probably take your proposed route or a similar one. 
However, i still won't know WHY it didn't work. I would really LIKE to know 
why, simply because it tickles me.

matt

 
 jmf

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Re: try... except with unknown error types

2011-08-19 Thread Mel

xDog Walker wrote:
 On Friday 2011 August 19 12:09, Yingjie Lin wrote:
[ ... ]
 Does anyone know what error type I should put after the except statement?
 or even better: is there a way not to specify the error types? Thank you.
 
 You probably need to import urllib2 before you can use urllib2.HTTPError.
 
 Otherwise, you can try using the base class:
 
 except Exception, e:

There are maybe better base classes to use.  Running the interpreter:
Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import urllib2
 help (urllib2.HTTPError)

will show you

class HTTPError(URLError, urllib.addinfourl)
 |  Raised when HTTP error occurs, but also acts like non-error return
 |  
 |  Method resolution order:
 |  HTTPError
 |  URLError
 |  exceptions.IOError
 |  exceptions.EnvironmentError
 |  exceptions.StandardError
 |  exceptions.Exception
 |  exceptions.BaseException
 

So catching any of urllib2.HTTPError, urllib2.URLError, IOError, 
EnvironmentError, or StandardError will detect the exception -- with 
increasing levels of generality.

Mel.

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Re: Stop quoting spam [was Re: Hot Girls ...]

2011-08-19 Thread D'Arcy J.M. Cain

On Fri, 19 Aug 2011 17:12:40 -0400
Matty Sarro msa...@gmail.com wrote:
 It was a joke, no need to be a prick about it.

It was spam.  You're the prick.  If you think spam is funny it's
because you aren't the one that has to spend your time dealing with the
fallout.  

 If you're that offended then spend the cycles fixing the damn list so it

Most of us have fixed it.  We didn't see the spam until you repeated
it.  For whatever reason the original message was caught by our
filters.  You helped the spammer break through.  I can assure you
though that your attitude means that you won't be able to help them
again.  I can hear the plonking going on all over the net.  Here's
another one;

*plonk*

No point in replying.  I won't hear it.  Hope you don't have any
important questions for the group.  It just became more of a read-only
list for you.

 If php, red hat, and perl can manage it for their lists, why not python? Is
 that a statement about python programmers?

And that should get you blacklisted by anyone on the cusp.

-- 
D'Arcy J.M. Cain da...@druid.net |  Democracy is three wolves
http://www.druid.net/darcy/|  and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP)   |  what's for dinner.
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Re: Help on PyQt4 QProcess

2011-08-19 Thread Edgar Fuentes

On Aug 19, 4:21 pm, Carl Banks pavlovevide...@gmail.com wrote:
 On Friday, August 19, 2011 12:55:40 PM UTC-7, Edgar Fuentes wrote:
  On Aug 19, 1:56 pm, Phil Thompson
   wrote:
   On Fri, 19 Aug 2011 10:15:20 -0700 (PDT), Edgar Fuentes
   fuen...@gmail.com wrote:
Dear friends,

I need execute an external program from a gui using PyQt4, to avoid
that hang the main thread, i must connect the signal finished(int)
of a QProcess to work properly.

for example, why this program don't work?

   from PyQt4.QtCore import QProcess
   pro = QProcess() # create QProcess object
   pro.connect(pro, SIGNAL('started()'), lambda
x=started:print(x))        # connect
   pro.connect(pro, SIGNAL(finished(int)), lambda
x=finished:print(x))
   pro.start('python',['hello.py'])        # star hello.py program
(contain print(hello world!))
   timeout = -1
   pro.waitForFinished(timeout)
   print(pro.readAllStandardOutput().data())

output:

   started
   0
   b'hello world!\n'

see that not emit the signal finished(int)

   Yes it is, and your lambda slot is printing 0 which is the return code
   of the process.

   Phil

  Ok, but the output should be:

      started
      b'hello world!\n'
      finished

  no?.

  thanks Phil

 Two issues.  First of all, your slot for the finished function does not have 
 the correct prototype, and it's accidentally not throwing an exception 
 because of your unnecessary use of default arguments.  Anyway, to fix that, 
 try this:

 pro.connect(pro, SIGNAL(finished(int)), lambda v, x=finished:print(x))

 Notice that it adds an argument to the lambda (v) that accepts the int 
 argument of the signal.  If you don't have that argument there, the int 
 argument goes into x, which is why Python prints 0 instead of finished.

 Second, processess run asynchrously, and because of line-buffering, IO can 
 output asynchronously, and so there's no guarantee what order output occurs.  
 You might try calling the python subprocess with the '-u' switch to force 
 unbuffered IO, which might be enough to force synchronous output (depending 
 on how signal/slot and subprocess semantics are implemented).

 Carl Banks

Thanks Carl, your intervention was very helpful for me, this solve my
semantic error. I need to study more about signal/slots and process.
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Re: try... except with unknown error types

2011-08-19 Thread Stephen Hansen

On 8/19/11 12:09 PM, Yingjie Lin wrote:
 try:
   response = urlopen(urljoin(uri1, uri2))
 except urllib2.HTTPError:
   print URL does not exist!
 
 Though urllib2.HTTPError is the error type reported by Python, Python 
 doesn't recognize it as an error type name. 
 I tried using HTTPError alone too, but that's not recognized either.

Exceptions are objects like any other, and they are defined in specific
places. Only the standard ones are available everywhere; things like
IndexError and AttributeError. See the 'exceptions' module for the
standard ones. Everything else, you have to 'grab' the object from where
it lives -- in this case, in urllib2.


 Does anyone know what error type I should put after the except statement? or 
 even better: is there a way not to specify
 the error types? Thank you.

You can use a bare except, like so:

   try:
   ...
   except:
   ...

But avoid it, if you can. Or at least, don't let it become
habit-forming: for networking code and interaction with external things,
I usually have a bare-except as a final fallback, after trying other
more specific things-- but only as a last resort.

FWIW, the error hierarchy of url fetching is more then a little bit
annoying. My own _request object I end up using for one of our services
catches, in order:

  try:
  ...
  except urllib2.HTTPError:
  except urllib2.URLError:
  except httplib.BadStatusLine:
  except httplib.HTTPException:
  except socket.timeout:
  except:


With each case logging and handling the error in a bit of a different
way. (Though most, eventually, resulting in the request being retried --
all in the name of a mandate that this particular bit of code must not,
under any circumstances, not ultimately work. Even going so far as to
start having hour long waits between retries until the  other side is
finally up :P)


-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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Description: OpenPGP digital signature
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Re: Help with regular expression in python

On Friday, August 19, 2011, Carl Banks wrote:
 On Friday, August 19, 2011 10:33:49 AM UTC-7, Matt Funk wrote:
  number = r\d\.\d+e\+\d+
  numbersequence = r%s( %s){31}(.+) % (number,number)
  instance_linetype_pattern = re.compile(numbersequence)
  
  The results obtained are:
  results:
  [(' 2.199000e+01', ' : (instance: 0)\t:\tsome description')]
  so this matches the last number plus the string at the end of the line,
  but no retaining the previous numbers.
  
  Anyway, i think at this point i will go another route. Not sure where the
  issues lies at this point.
 
 I think the problem is that repeat counts don't actually repeat the
 groupings; they just repeat the matchings.  Take this expression:
 
 r(\w+\s*){2}
I see

 
 This will match exactly two words separated by whitespace.  But the match
 result won't contain two groups; it'll only contain one group, and the
 value of that group will match only the very last thing repeated:
 
 Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53)
 [GCC 4.5.2] on linux2
 Type help, copyright, credits or license for more information.
 
  import re
  m = re.match(r(\w+\s*){2},abc def)
  m.group(1)
 
 'def'
 
 So you see, the regular expression is doing what you think it is, but the
 way it forms groups is not.
 
 
 Just a little advice (I know you've found a different method, and that's
 good, this is for the general reader).
 
 The functions re.findall and re.finditer could have helped here, they find
 all the matches in a string and let you iterate through them.  (findall
 returns the strings matched, and finditer returns the sequence of match
 objects.)  You could have done something like this:
I did use findall but when i tried to match the everything (including the 'some 
description' part) it did not work. But i think the explanation you gave above 
matches this case and explains why it did not.


 
 row = [ float(x) for x in re.findall(r'\d+\.\d+e\+d+',line) ]
 
 And regexp matching is often overkill for a particular problem; this may be
 of them.  line.split() could have been sufficient:
 
 row = [ float(x) for x in line.split() ]
 
 Of course, these solutions don't account for the case where you have lines,
 some of which aren't 32 floating-point numbers.  You need extra error
 handling for that, but you get the idea.

thanks
matt

 
 
 Carl Banks

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Re: Replacement for the shelve module?

2011-08-19 Thread Robert Kern


On 8/19/11 3:36 PM, Steven D'Aprano wrote:


By the way, you know that you should never, ever use floats for currency,
right?


That's just incorrect. You shouldn't use (binary) floats for many *accounting* 
purposes, but for many financial/econometric analyses, floats are de rigeur and 
work much better than decimals (either floating or fixed point). If you are 
collecting gigs of stock prices, you are much more likely to be doing the latter 
than the former.


--
Robert Kern

I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth.
  -- Umberto Eco

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Re: How to make statements running in strictly sequential fashion like in an interactive shell

2011-08-19 Thread aspineux

On Aug 19, 5:00 pm, lzlu123 lzlu...@gmail.com wrote:
 I have an instrument that has a RS232 type serial comm port and I need
 to connect to and control. I use Python 3.2 in Windows XP, plus
 pySerial module. I have a problem when I execute a script consisting
 of statements that open the comm port, configure it, write strings to
 and receive strings from it. Thoese strings aer either commands
 pertinent to the instrument (control) or responses from the instrument
 (response).

 When those statements are executed in a python interpreter
 interactively (at ), I get what I expect and the results are good
 and correct. However, when I execute the script, either being invoked
 within the interpreter or run file, I don’t get what I want. The
 statements in the script is the same as what I use in the interactive
 interpreter.

 Why do I get the strange behavior and how can I change the script to
 make it to behave like in interactive interpreter?

 --script---
 def read(comport):

     wrt_str=b'movt 3000'+b'\r\n'
     ret_str=comport.write(wrt_str)

     wrt_str=b'scan'+b'\r\n'
     ret_str=comport.write(wrt_str)

     rsp_str=comport.readlines() #1


You use readlines() with a s at the end !

* Note that when the serial port was opened with no timeout, that
readline()
* blocks until it sees a newline (or the specified size is reached)
* and that readlines() would never return and therefore refuses to
work
* (it raises an exception in this case)!


     wrt_str=b'hllo'+b'\r\n'
     ret_str=comport.write(wrt_str)

     rsp_str=comport.readlines()#2
 --

 The problem is with the lines above with ###. In interactive mode,
 there is about 1 second delay at #1, and 9 seonds delay at #2. I get
 correct responses there. However, if I execute the script above, there
 is no delay at all and I get incorrect results (garbage). I set the
 read timeout to 0 in comm port set up, as

 comport.timeout=0
 So the comport should be in blocking mode if it waits for the end of
 line or end of file.

Wrong :

timeout = None: wait forever
timeout = 0: non-blocking mode (return immediately on read)
timeout = x: set timeout to x seconds (float allowed)


 I tried many things, like exec (execfile in 2.7), but at no avail.

 I have an update to the original post I made a few days ago. I think I
 know what the problem is and want to know if anyone has a solution:

 After putting print and time.sleep(delay) after every statement, I
 found when the script is running, it appears going around the pyserial
 statement, such as comport.write(..) or comport.readlines(...)
 while the pyserial command is executing (appearing as waiting and
 busying doing some thing, you know serial port is slow). So for
 example, when I exec all statements in a python interactive shell, I
 am not able to type and run a new statement if the previous one is not
 returned. Let's ay, if comport.readlines() is not returning, I can't
 type and run the next comport.write(...) statemtn. However, in a
 script that is running, if the comport.readlines() is busy reading,
 the next statement is running, if the next statement happens to be a
 comport.write() which will abort the reading.

 Is there any way to force the python script to behave like running
 exactly sequentially?


You have some new things to try

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Re: Replacement for the shelve module?

2011-08-19 Thread Dan Stromberg

On Fri, Aug 19, 2011 at 8:31 AM, Forafo San ppv.g...@gmail.com wrote:

 Folks,
 What might be a good replacement for the shelve module, but one that
 can handle a few gigs of data. I'm doing some calculations on daily
 stock prices and the result is a nested list like:

 [[date_1, floating result 1],
  [date_2, floating result 2],
 ...
  [date_n, floating result n]]

 However, there are about 5,000 lists like that, one for each stock
 symbol. Using the shelve module I could easily save them to a file
 ( myshelvefile['symbol_1') = symbol_1_list) and likewise retrieve the
 data. But shelve is deprecated AND when a lot of data is written
 shelve was acting weird (refusing to write, filesizes reported with an
 ls did not make sense, etc.).


I'd probably use a cachedb, though perhaps I'm biased since I wrote it:
http://stromberg.dnsalias.org/~dstromberg/cachedb.html

It'll allow you to specify functions for serializing and deserializing
values (but not keys), and cache a user-specified number of values in
virtual memory.  IOW, once you instantiate the class, you pretty much get
caching and seralizing/deserializing as freebies, without the details of
same getting scattered throughout your code.

It wraps something like gdbm.
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Re: Stop quoting spam [was Re: Hot Girls ...]

2011-08-19 Thread Albert W. Hopkins



On Friday, August 19 at 17:12 (-0400), Matty Sarro said:

 
 If you're that offended then spend the cycles fixing the damn list so
 it
 stops having so much spam. You realize spam comes in almost
 constantly,
 right? Enough that multiple tines over the past weeks there have been
 no
 less than 3 threads about it.

For me, the original post ended in my spam box, which means my filter is
doing it's job, but when you re-post it, my filter did not regard it as
spam.  I actually wish it had.  Therefore you are an enabler.


 If php, red hat, and perl can manage it for their lists, why not
 python? Is
 that a statement about python programmers?
 

The python list is (also) a Usenet newsgroup.  Usenet is distributed and
therefore there is no central place to filter spam (each usenet host
would have to have its own filter and what one considers spam another
might consider ham)... anyway, that's neither here nor there.  Having my
own filter usually works.

I'm not here to dis you, just to try to help you understand the how/why
regarding the re-post and why your attitude about it might give the
impression of apathy toward your peer community.




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Re: Replacement for the shelve module?

Robert Kern wrote:

 On 8/19/11 3:36 PM, Steven D'Aprano wrote:
 
 By the way, you know that you should never, ever use floats for currency,
 right?
 
 That's just incorrect. You shouldn't use (binary) floats for many
 *accounting* purposes, but for many financial/econometric analyses, floats
 are de rigeur and work much better than decimals (either floating or fixed
 point). If you are collecting gigs of stock prices, you are much more
 likely to be doing the latter than the former.


That makes sense, and I stand corrected.



-- 
Steven

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Re: testing if a list contains a sublist

Johannes wrote:

 hi list,
 what is the best way to check if a given list (lets call it l1) is
 totally contained in a second list (l2)?
[...]

For anyone interested, here's a pair of functions that implement
sub-sequence testing similar to str.find and str.rfind:


http://code.activestate.com/recipes/577850-search-sequences-for-sub-sequence/



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Steven

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Re: How to make statements running in strictly sequential fashion like in an interactive shell

2011-08-19 Thread Javier

Never used it, but I think you can try this:

Pexpect - a Pure Python Expect-like module
Pexpect is a pure Python Expect-like module. Pexpect makes Python...
www.noah.org/python/pexpect/ 




lzlu123 lzlu...@gmail.com wrote:
 I have an instrument that has a RS232 type serial comm port and I need
 to connect to and control. I use Python 3.2 in Windows XP, plus
 pySerial module. I have a problem when I execute a script consisting
 of statements that open the comm port, configure it, write strings to
 and receive strings from it. Thoese strings aer either commands
 pertinent to the instrument (control) or responses from the instrument
 (response).
 
 When those statements are executed in a python interpreter
 interactively (at ), I get what I expect and the results are good
 and correct. However, when I execute the script, either being invoked
 within the interpreter or run file, I don???t get what I want. The
 statements in the script is the same as what I use in the interactive
 interpreter.
 
 Why do I get the strange behavior and how can I change the script to
 make it to behave like in interactive interpreter?
 
 --script---
 def read(comport):
 
wrt_str=b'movt 3000'+b'\r\n'
ret_str=comport.write(wrt_str)
 
wrt_str=b'scan'+b'\r\n'
ret_str=comport.write(wrt_str)
 
rsp_str=comport.readlines() #1
 
wrt_str=b'hllo'+b'\r\n'
ret_str=comport.write(wrt_str)
 
rsp_str=comport.readlines()#2
 --
 
 The problem is with the lines above with ###. In interactive mode,
 there is about 1 second delay at #1, and 9 seonds delay at #2. I get
 correct responses there. However, if I execute the script above, there
 is no delay at all and I get incorrect results (garbage). I set the
 read timeout to 0 in comm port set up, as
 
 comport.timeout=0
 So the comport should be in blocking mode if it waits for the end of
 line or end of file.
 
 I tried many things, like exec (execfile in 2.7), but at no avail.
 
 I have an update to the original post I made a few days ago. I think I
 know what the problem is and want to know if anyone has a solution:
 
 After putting print and time.sleep(delay) after every statement, I
 found when the script is running, it appears going around the pyserial
 statement, such as comport.write(..) or comport.readlines(...)
 while the pyserial command is executing (appearing as waiting and
 busying doing some thing, you know serial port is slow). So for
 example, when I exec all statements in a python interactive shell, I
 am not able to type and run a new statement if the previous one is not
 returned. Let's ay, if comport.readlines() is not returning, I can't
 type and run the next comport.write(...) statemtn. However, in a
 script that is running, if the comport.readlines() is busy reading,
 the next statement is running, if the next statement happens to be a
 comport.write() which will abort the reading.
 
 Is there any way to force the python script to behave like running
 exactly sequentially?
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Re: List spam

2011-08-19 Thread Javier

You will lose a lot of people asking/answering interesting stuff, and
maybe eventually the list will die.  Me (like many people with little
free time) seldom post in blogs/forums/mailing lists where I need to
register.

gene heskett ghesk...@wdtv.com wrote:
 That is asking the user to take considerable effort and resources to do 
 that.  What is wrong with the mailing list only approach?


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Python Windows Extensions for Mac

2011-08-19 Thread johnny.venter


Hello, I am looking for the Python Windows Extensions to see if they can be 
installed on a Mac.THanks.

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Re: Python Windows Extensions for Mac

2011-08-19 Thread Adam Jorgensen

You mean pywin32?

They sure don't install on linux so that should give you a clue...



On 19 August 2011 22:02, johnny.venter johnny.ven...@zoho.com wrote:


 Hello, I am looking for the Python Windows Extensions to see if they can be
 installed on a Mac.THanks.

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Re: Python Windows Extensions for Mac

2011-08-19 Thread Chris Rebert

On Fri, Aug 19, 2011 at 1:02 PM, johnny.venter johnny.ven...@zoho.com wrote:

 Hello, I am looking for the Python Windows Extensions to see if they can be 
 installed on a Mac.THanks.

Your request is nonsensical. pywin32 wraps the Windows API libraries.
Mac OS X is not Windows; it does not implement the Windows API. Thus,
there is nothing for pywin32 to wrap on a Mac. Square peg, round hole.

Cheers,
Chris
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Re: try... except with unknown error types

2011-08-19 Thread Seebs

On 2011-08-19, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote:
 Even if you don't think it's the ethical thing to do, consider that someday
 you might be maintaining code written by the OP :)

A common further conclusion people reach is but then I will be able to get
a job fixing it!

Trust me, this is NOT where you want to go.  :)

-s
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http://en.wikipedia.org/wiki/Fair_Game_(Scientology) -- get educated!
I am not speaking for my employer, although they do rent some of my opinions.
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[issue12780] Clean up tests for pyc/pyo in file


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 98d13885a574 by Vinay Sajip in branch '3.2':
Issue #12780: Removed checks in logging for .pyc/.pyo in __file__.
http://hg.python.org/cpython/rev/98d13885a574

New changeset ac0c04d8eafb by Vinay Sajip in branch 'default':
Issue #12780: Merged fix from 3.2.
http://hg.python.org/cpython/rev/ac0c04d8eafb

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-08-19 Thread Marc-Andre Lemburg


Marc-Andre Lemburg m...@egenix.com added the comment:

James Y Knight wrote:
 
 James Y Knight f...@users.sourceforge.net added the comment:
 
 Sure, you can compile and run Python on both versions of Linux, but
 what if your application uses features that are only present in Linux
 3.0 and later ?
 
 This comment is making me think you've missed just how irrelevant kernel 
 version 3.0 really is. To a first approximation, it *has no new features*. 
 Now, to be sure, there are a couple of things, sure. Just like there were a 
 couple new features in 2.6.39 two months earlier, 2.6.38 two months before 
 that, 2.6.37 two months before that, and so on, every 2-3 months, back to the 
 release of 2.6.7 or so in 2004.

I am aware of the history behind that version number change. The
difference between Linux 2.x and 3.x may be small nowadays, but
another 20 kernel releases down the road, the difference will show.

 BTW: The new attribute should contain the complete version number,
 not just the major version. `uname -r` would provide a good start.
 
 To be useful, that would have to be a runtime-computed thing, not the 
 build-time value that sys.platform's trailing number is. But we already have 
 that: os.uname(). It certainly doesn't need a second name.

There are two aspects to consider:

1. The platform Python (and presumably the application) was
   compiled on.

2. The platform Python and the application are currently
   running on.

Both Python and the application will make certain assumptions about
the platform depending on the compile time environment. If the
deployment platform is too different from that environment, it
won't run or not as expected. So you need both the compile and the
runtime version information.

The suggested change removes the compile time information from
the platform string, so that information needs to be preserved
in a new attribute.

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-08-19 Thread Martin von Gagern


Martin von Gagern martin.vgag...@gmx.net added the comment:

As people keep stating how easy the change from sys.platform == 'linux2' to 
sys.platform.startswith('linux') is, e.g. msg142385, please also keep in mind 
cases like someDict.get(sys.platform) where the comparison is implicit and 
therefore a simple change to startswith won't do the trick. Seen that in the 
wild.

Besides that, I can only wholeheartedly agree to the points so eloquently 
described by Martin v. Löwis and James Y Knight. Thanks!

Let's please force it to 'linux2' for the next 2.7 and 3.2 releases, so people 
can use recent kernels without breaking (or having to rewrite) third-party 
apps. Let's also encourage distros to do the same for older releases, perhaps 
even suggesting patches.

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-08-19 Thread Martin von Gagern


Martin von Gagern martin.vgag...@gmx.net added the comment:

Marc-Andre Lemburg wrote:
 Both Python and the application will make certain assumptions about
 the platform depending on the compile time environment.

Can you give examples for this?

 So you need both the compile and the runtime version information.

I very much doubt that any feature in Python is actually enabled if
compiled under Linux 3. If so that's probably a bug in Python, due to
the small number of features added from 2.6.39 to 3.0. Either the
feature was introduced into Linux before 3.0, in which case Python
should use it as early as possible, or the feature was introduced in
some 3.x release, in which case not all Linux 3 builds will have it.

So the single digit major number will not be enough for this kind of
checks, and the safest way is to check for the feature itself, e.g. by
simply using it and handling NotImplementedException appropriately. That
approach is more portable for new platforms as well.

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-08-19 Thread Marc-Andre Lemburg


Marc-Andre Lemburg m...@egenix.com added the comment:

Martin von Gagern wrote:
 
 Martin von Gagern martin.vgag...@gmx.net added the comment:
 
 Marc-Andre Lemburg wrote:
 Both Python and the application will make certain assumptions about
 the platform depending on the compile time environment.
 
 Can you give examples for this?

Sure, just have a look at how different the various minor release
Mac OS X versions are. They even changed the default architecture
without bumping the major version of the OS.

A configure run on one OS version will pick up different
environment settings than on a later one. As a result Python
and application extensions use different libs/packages/tools
or even create completely different runtimes (e.g. one for PPC,
the other for i386).

 So you need both the compile and the runtime version information.
 
 I very much doubt that any feature in Python is actually enabled if
 compiled under Linux 3. If so that's probably a bug in Python, due to
 the small number of features added from 2.6.39 to 3.0. Either the
 feature was introduced into Linux before 3.0, in which case Python
 should use it as early as possible, or the feature was introduced in
 some 3.x release, in which case not all Linux 3 builds will have it.
 
 So the single digit major number will not be enough for this kind of
 checks, and the safest way is to check for the feature itself, e.g. by
 simply using it and handling NotImplementedException appropriately. That
 approach is more portable for new platforms as well.

That works fine for features that you can programmatically
control. It doesn't work well for static data that you provide
externally depending on the platform OS version. Take e.g.
the plat-freebsdN directories with the OS dependent
constants/functions as example.

As already mentioned, the diff between Linux 2.x and 3.x will
grow over time and while there may not be much to see now,
things will change in the coming years.

Just look at the differences between plat-linux1 and plat-linux2
(plat-linux1 was phased out in Python 2.4 so you have to go back
to Python 2.3 or earlier).

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[issue10504] Trivial mingw compile fixes

2011-08-19 Thread Kalev Lember


Changes by Kalev Lember kalevlem...@gmail.com:


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[issue10293] PyMemoryView object has obsolete members

2011-08-19 Thread Stefan Krah


Stefan Krah stefan-use...@bytereef.org added the comment:

I think PyBUF_SHADOW was the renamed version of PyBUF_UPDATEIFCOPY
from the PEP. :)

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[issue12650] Subprocess leaks fd upon kill()

2011-08-19 Thread Charles-François Natali


Charles-François Natali neolo...@free.fr added the comment:

The test now passes on the buildbots, closing.

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[issue12783] test_posix failure on FreeBSD 6.4: test_get_and_set_scheduler_and_param

2011-08-19 Thread Charles-François Natali


New submission from Charles-François Natali neolo...@free.fr:

http://www.python.org/dev/buildbot/all/builders/x86%20FreeBSD%206.4%203.x/builds/1734/steps/test/logs/stdio


==
ERROR: test_get_and_set_scheduler_and_param (test.test_posix.PosixTester)
--
Traceback (most recent call last):
  File 
/usr/home/db3l/buildarea/3.x.bolen-freebsd/build/Lib/test/test_posix.py, line 
878, in test_get_and_set_scheduler_and_param
posix.sched_setparam(0, param)
OSError: [Errno 22] Invalid argument

--


The reason is quite simple:

http://freebsd.active-venture.com/FreeBSD-srctree/newsrc/posix4/ksched.c.html


/*
 * XXX About priorities
 *
 *  POSIX 1003.1b requires that numerically higher priorities be of
 *  higher priority.  It also permits sched_setparam to be
 *  implementation defined for SCHED_OTHER.  I don't like
 *  the notion of inverted priorites for normal processes when
 *  you can use setpriority for that.
 *
 *  I'm rejecting sched_setparam for SCHED_OTHER with EINVAL.
 */

[...]
int ksched_setparam(register_t *ret, struct ksched *ksched,
struct proc *p, const struct sched_param *param)
{
register_t policy;
int e;

e = getscheduler(policy, ksched, p);

if (e == 0)
{
if (policy == SCHED_OTHER)
e = EINVAL;
else
e = ksched_setscheduler(ret, ksched, p, policy, param);
}

return e;
}



And indeed, sched_setparam is implementation-defined if the process' scheduling 
policy is SCHED_OTHER, see 
http://pubs.opengroup.org/onlinepubs/007908799/xsh/sched_setparam.html

If the current scheduling policy for the process specified by pid is not 
SCHED_FIFO or SCHED_RR, including SCHED_OTHER, the result is 
implementation-dependent.


It seems that FreeBSD made the choice of returning EINVAL, but it changed in 
recent versions (the test passes on FreeBSD 8).

I'm not sure about the best solution though:
1) don't perform this test if the scheduling policy is not SCHED_RR or 
SCHED_FIFO
2) skip this test on FreeBSD versions that return EINVAL (maybe adding a new 
requires_freebsd_version to test.support)

--
components: Tests
messages: 142423
nosy: benjamin.peterson, neologix
priority: normal
severity: normal
stage: needs patch
status: open
title: test_posix failure on FreeBSD 6.4: test_get_and_set_scheduler_and_param
type: behavior

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[issue12707] Deprecate addinfourl getters


Éric Araujo mer...@netwok.org added the comment:

 For these two reasons I propose to:
  * document the 3 attributes as the suggested way to access this
information;
  * deprecate the 3 getters;
  * avoid to document the now undocumented getcode();
+1

 The addclosehook class could be provided via an alternative constructor
I can’t say why, but I don’t like that.

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-08-19 Thread Antoine Pitrou


Antoine Pitrou pit...@free.fr added the comment:

 The suggested change removes the compile time information from
 the platform string, so that information needs to be preserved
 in a new attribute.

-1 on any new platform identification attribute. We already have too
many of them, and there's the platform module for precise
identification.

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[issue11564] pickle not 64-bit ready

2011-08-19 Thread Antoine Pitrou


Antoine Pitrou pit...@free.fr added the comment:

 I have tried running the tests on a machine with 12GB of RAM, but when I do 
 so,
 the new tests get skipped saying not enough memory, even when I specify -M 
 11G
 on the command-line.

How much does it say is required?
Did you remove the skips in BigmemPickleTests?

  The problem seems to be the change to the precisionbigmemtest
 decorator in test.support. I don't understand what the purpose of the dryrun
 flag is, but the modified condition for skipping doesn't look right to me.

Well, perhaps I got the logic wrong. Debugging welcome :)

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[issue12256] Link isinstance/issubclass doc to abc module


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset eeb8a440bde0 by Éric Araujo in branch '3.2':
Link isinstance/issubclass to the ABC glossary entry (#12256)
http://hg.python.org/cpython/rev/eeb8a440bde0

New changeset e2e8c752c1b6 by Éric Araujo in branch '3.2':
Mention virtual subclasses in the glossary entry for ABCs (#12256).
http://hg.python.org/cpython/rev/e2e8c752c1b6

New changeset 5160d8eb3468 by Éric Araujo in branch 'default':
Merge fixes for #12256 and typos from 3.2
http://hg.python.org/cpython/rev/5160d8eb3468

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[issue1626300] 'Installing Python Modules' does not work for Windows


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 59f7bbe1236c by Éric Araujo in branch '3.2':
Remove obsolete term + indicate how to find the program (#1626300).
http://hg.python.org/cpython/rev/59f7bbe1236c

New changeset adaec1a0dd47 by Éric Araujo in branch '3.2':
Fix instance I missed in 59f7bbe1236c (#1626300)
http://hg.python.org/cpython/rev/adaec1a0dd47

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[issue10149] Data truncation in expat parser


Éric Araujo mer...@netwok.org added the comment:

I was about to commit an edited version of your patch (attached) but then I 
thought we should check whether this isn’t really a bug.  I just don’t see why 
expat would chunk without paying heed to the newlines if it is supposed to 
chunk at newlines.

--
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[issue12256] Link isinstance/issubclass doc to abc module


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 96222062239f by Éric Araujo in branch '2.7':
Link isinstance/issubclass to the ABC glossary entry (#12256)
http://hg.python.org/cpython/rev/96222062239f

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[issue10745] setup.py install --user option undocumented


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset 25a48fe791e6 by Éric Araujo in branch '2.7':
Add documentation for PEP 370 features in distutils (#10745).
http://hg.python.org/cpython/rev/25a48fe791e6

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[issue8617] Better document user site-packages in site module doc


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset b3f72b6450f1 by Éric Araujo in branch '2.7':
Improve documentation for PEP 370 support in site module (#8617).
http://hg.python.org/cpython/rev/b3f72b6450f1

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[issue1626300] 'Installing Python Modules' does not work for Windows


Roundup Robot devn...@psf.upfronthosting.co.za added the comment:

New changeset e9022dc7a411 by Éric Araujo in branch '2.7':
Remove obsolete term + indicate how to find the program (#1626300).
http://hg.python.org/cpython/rev/e9022dc7a411

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[issue10745] setup.py install --user option undocumented


Changes by Éric Araujo mer...@netwok.org:


--
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nosy: +alexis
resolution:  - fixed
stage:  - committed/rejected
status: open - closed
versions: +Python 2.7, Python 3.2, Python 3.3 -3rd party

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[issue11564] pickle not 64-bit ready

2011-08-19 Thread Nadeem Vawda


Nadeem Vawda nadeem.va...@gmail.com added the comment:

 How much does it say is required?
 Did you remove the skips in BigmemPickleTests?

Yes, I did remove the skips. It says 2GB for some, and 4GB for others.

 Well, perhaps I got the logic wrong. Debugging welcome :)

I'd be glad to do so, but I'm not sure what the aim of the dryrun flag is.
Do you want to make it the default that precisionbigmem tests are skipped,
unless the decorator invocation explicitly specifies dryrun=False?

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[issue8617] Better document user site-packages in site module doc


Changes by Éric Araujo mer...@netwok.org:


--
resolution:  - fixed
stage: patch review - committed/rejected
status: open - closed

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[issue12256] Link isinstance/issubclass doc to abc module


Éric Araujo mer...@netwok.org added the comment:

I committed a modified version of the patch.

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[issue11564] pickle not 64-bit ready

2011-08-19 Thread Antoine Pitrou


Antoine Pitrou pit...@free.fr added the comment:

 I'd be glad to do so, but I'm not sure what the aim of the dryrun flag is.
 Do you want to make it the default that precisionbigmem tests are skipped,
 unless the decorator invocation explicitly specifies dryrun=False?

No, the point is to avoid running these tests when -M is not specified.
See what happens with other bigmem tests.

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[issue9173] logger statement not guarded in shutil._make_tarball


Éric Araujo mer...@netwok.org added the comment:

I fixed this in 615a29295d5f but forgot to mention the bug number in the commit 
message.  To reproduce the bug, I only had to backport two lines from 3.2, so I 
did not use your patch.  Thanks to both of you nonetheless for the report and 
help!

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assignee: tarek - eric.araujo
resolution:  - fixed
stage: patch review - committed/rejected
status: open - closed
versions:  -Python 3.1, Python 3.2

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[issue12703] Improve error reporting for packaging.util.resolve_name