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Change in Python 3.3 with the treatment of sys.argv

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  Change in Python 3.3 with the treatment of sys.argv "Colin J. Williams" <cjw@ncf.ca> - 2013-03-22 17:57 -0400
    Re: Change in Python 3.3 with the treatment of sys.argv Chris Angelico <rosuav@gmail.com> - 2013-03-23 09:13 +1100
    Re: Change in Python 3.3 with the treatment of sys.argv Ethan Furman <ethan@stoneleaf.us> - 2013-03-22 15:11 -0700
      Re: Change in Python 3.3 with the treatment of sys.argv "Colin J. Williams" <cjw@ncf.ca> - 2013-03-23 06:43 -0400
        Re: Change in Python 3.3 with the treatment of sys.argv Peter Otten <__peter__@web.de> - 2013-03-23 11:59 +0100
      Re: Change in Python 3.3 with the treatment of sys.argv "Colin J. Williams" <cjw@ncf.ca> - 2013-03-23 06:43 -0400
      Re: Change in Python 3.3 with the treatment of sys.argv "Colin J. Williams" <cjw@ncf.ca> - 2013-03-23 08:27 -0400
        Re: Change in Python 3.3 with the treatment of sys.argv Chris Angelico <rosuav@gmail.com> - 2013-03-23 23:34 +1100
      Re: Change in Python 3.3 with the treatment of sys.argv "Colin J. Williams" <cjw@ncf.ca> - 2013-03-23 08:27 -0400
    Re: Change in Python 3.3 with the treatment of sys.argv Peter Otten <__peter__@web.de> - 2013-03-22 23:33 +0100
    Re: Change in Python 3.3 with the treatment of sys.argv Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-22 23:45 +0000

#41701 — Change in Python 3.3 with the treatment of sys.argv

Below is an extract from some code to run on Python 2.7.3, 3.2.3 and 
3.3.0 to compare speeds, both between versions and machines:

if __name__ == '__main__':
     # Text string for initial test - Modify for your own machine or
     # delete it and and answer the input statement with your own machine
     # characteristics.
     sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB 
Disk Free space', )
     main()


def main():
     if len(sys.argv) > 1:
         idMachine= ' '.join(sys.argv[1:])
     ...
     oFile= open('FP' + now + '.log', 'w')
     oFile.writelines(idM + '\n' + sys.version + '\n')

For 2.7, the result is:
Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]

for 3.2, the result is:
Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]

For 3.3, the result is:
I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit 
(Intel)]

The full test result, for random matrices of increasing order is 
available here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)

Colin W.

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#41703

On Sat, Mar 23, 2013 at 8:57 AM, Colin J. Williams <cjw@ncf.ca> wrote:
> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and 3.3.0
> to compare speeds, both between versions and machines:

Can you post the actual code in question, please? There are several
problems with the code as posted: main() isn't defined when it gets
called up top, idM vs idMachine, and now isn't defined. I'm guessing
that the difference is somewhere in idM vs idMachine, but that may be
completely off the mark.

ChrisA

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#41704

On 03/22/2013 02:57 PM, Colin J. Williams wrote:
> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and 3.3.0 to compare speeds, both between versions and
> machines:
>
> if __name__ == '__main__':
>      # Text string for initial test - Modify for your own machine or
>      # delete it and and answer the input statement with your own machine
>      # characteristics.
>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB Disk Free space', )
>      main()
>
>
> def main():
>      if len(sys.argv) > 1:
>          idMachine= ' '.join(sys.argv[1:])
>      ...
>      oFile= open('FP' + now + '.log', 'w')
>      oFile.writelines(idM + '\n' + sys.version + '\n')
>
> For 2.7, the result is:
> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>
> for 3.2, the result is:
> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
>
> For 3.3, the result is:
> I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
>
> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit (Intel)]
>
> The full test result, for random matrices of increasing order is available
> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)

First, this is what I get with 3.3:

Python 3.3.0 (default, Sep 29 2012, 17:14:58)
[GCC 4.7.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
--> import sys
--> sys.argv
['']
--> sys.argv[1:] = ('this is a test!', )
--> sys.argv
['', 'this is a test!']
--> ' '.join(sys.argv[1:])
'this is a test!'


Second, your code doesn't show being joined by an underscore.

--
~Ethan~

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#41724

On 22/03/2013 6:11 PM, Ethan Furman wrote:
> On 03/22/2013 02:57 PM, Colin J. Williams wrote:
>> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
>> 3.3.0 to compare speeds, both between versions and
>> machines:
>>
>> if __name__ == '__main__':
>>      # Text string for initial test - Modify for your own machine or
>>      # delete it and and answer the input statement with your own machine
>>      # characteristics.
>>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB
>> Disk Free space', )
>>      main()
>>
>>
>> def main():
>>      if len(sys.argv) > 1:
>>          idMachine= ' '.join(sys.argv[1:])
>>      ...
>>      oFile= open('FP' + now + '.log', 'w')
>>      oFile.writelines(idM + '\n' + sys.version + '\n')
>>
>> For 2.7, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>>
>> for 3.2, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
>>
>> For 3.3, the result is:
>> I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
>>
>>
>> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit
>> (Intel)]
>>
>> The full test result, for random matrices of increasing order is
>> available
>> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)
>
> First, this is what I get with 3.3:
>
> Python 3.3.0 (default, Sep 29 2012, 17:14:58)
> [GCC 4.7.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> --> import sys
> --> sys.argv
> ['']
> --> sys.argv[1:] = ('this is a test!', )
> --> sys.argv
> ['', 'this is a test!']
> --> ' '.join(sys.argv[1:])
> 'this is a test!'
>
>
> Second, your code doesn't show being joined by an underscore.
>
> --
> ~Ethan~

No, the same program ran against each of the three versions.  I assume 
that 3.3 behaves differently.

Colin W.

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#41726

Colin J. Williams wrote:

> No, the same program ran against each of the three versions.  I assume
> that 3.3 behaves differently.

Please show some cooperation -- post actual code that shows the behaviour. 
Cut and paste instead of paraphrasing. 

Make it as small as you can. In your case that should be easy -- just rip 
out the actual benchmark and keep in only the tiny part that processes and 
prints sys.argv.

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#41725

On 22/03/2013 6:11 PM, Ethan Furman wrote:
> On 03/22/2013 02:57 PM, Colin J. Williams wrote:
>> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
>> 3.3.0 to compare speeds, both between versions and
>> machines:
>>
>> if __name__ == '__main__':
>>      # Text string for initial test - Modify for your own machine or
>>      # delete it and and answer the input statement with your own machine
>>      # characteristics.
>>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB
>> Disk Free space', )
>>      main()
>>
>>
>> def main():
>>      if len(sys.argv) > 1:
>>          idMachine= ' '.join(sys.argv[1:])
>>      ...
>>      oFile= open('FP' + now + '.log', 'w')
>>      oFile.writelines(idM + '\n' + sys.version + '\n')
>>
>> For 2.7, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>>
>> for 3.2, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
>>
>> For 3.3, the result is:
>> I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
>>
>>
>> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit
>> (Intel)]
>>
>> The full test result, for random matrices of increasing order is
>> available
>> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)
>
> First, this is what I get with 3.3:
>
> Python 3.3.0 (default, Sep 29 2012, 17:14:58)
> [GCC 4.7.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> --> import sys
> --> sys.argv
> ['']
> --> sys.argv[1:] = ('this is a test!', )
> --> sys.argv
> ['', 'this is a test!']
> --> ' '.join(sys.argv[1:])
> 'this is a test!'
>
>
> Second, your code doesn't show being joined by an underscore.
>
> --
> ~Ethan~

No, the same program ran against each of the three versions.  I assume 
that 3.3 behaves differently.

Colin W.

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#41728

On 22/03/2013 6:11 PM, Ethan Furman wrote:
> On 03/22/2013 02:57 PM, Colin J. Williams wrote:
>> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
>> 3.3.0 to compare speeds, both between versions and
>> machines:
>>
>> if __name__ == '__main__':
>>      # Text string for initial test - Modify for your own machine or
>>      # delete it and and answer the input statement with your own machine
>>      # characteristics.
>>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB
>> Disk Free space', )
>>      main()
>>
>>
>> def main():
>>      if len(sys.argv) > 1:
>>          idMachine= ' '.join(sys.argv[1:])
>>      ...
>>      oFile= open('FP' + now + '.log', 'w')
>>      oFile.writelines(idM + '\n' + sys.version + '\n')
>>
>> For 2.7, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>>
>> for 3.2, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
>>
>> For 3.3, the result is:
>> I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
>>
>>
>> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit
>> (Intel)]
>>
>> The full test result, for random matrices of increasing order is
>> available
>> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)
>
> First, this is what I get with 3.3:
>
> Python 3.3.0 (default, Sep 29 2012, 17:14:58)
> [GCC 4.7.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> --> import sys
> --> sys.argv
> ['']
> --> sys.argv[1:] = ('this is a test!', )
> --> sys.argv
> ['', 'this is a test!']
> --> ' '.join(sys.argv[1:])
> 'this is a test!'
>
>
> Second, your code doesn't show being joined by an underscore.
>
> --
> ~Ethan~

APOLOGIES to those who responded.

It seems that a change was made in the program between the 3.3 run and 
the other runs.

Each produces the same heading now.

Yes, I should have posted the test code.  But, in these circumstances, 
there is no point in doing that.

Colin W.

Colin W.

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#41730

On Sat, Mar 23, 2013 at 11:27 PM, Colin J. Williams <cjw@ncf.ca> wrote:
> It seems that a change was made in the program between the 3.3 run and the
> other runs.
>
> Each produces the same heading now.

Yep, this is why the simple testcase is so valuable :) Check out
http://sscce.org/ (which Steven also pointed you to) - note the points
made under "Short".

Glad it's solved, anyhow!

ChrisA

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#41729

On 22/03/2013 6:11 PM, Ethan Furman wrote:
> On 03/22/2013 02:57 PM, Colin J. Williams wrote:
>> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
>> 3.3.0 to compare speeds, both between versions and
>> machines:
>>
>> if __name__ == '__main__':
>>      # Text string for initial test - Modify for your own machine or
>>      # delete it and and answer the input statement with your own machine
>>      # characteristics.
>>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB
>> Disk Free space', )
>>      main()
>>
>>
>> def main():
>>      if len(sys.argv) > 1:
>>          idMachine= ' '.join(sys.argv[1:])
>>      ...
>>      oFile= open('FP' + now + '.log', 'w')
>>      oFile.writelines(idM + '\n' + sys.version + '\n')
>>
>> For 2.7, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
>>
>> for 3.2, the result is:
>> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
>> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
>>
>> For 3.3, the result is:
>> I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
>>
>>
>> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit
>> (Intel)]
>>
>> The full test result, for random matrices of increasing order is
>> available
>> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)
>
> First, this is what I get with 3.3:
>
> Python 3.3.0 (default, Sep 29 2012, 17:14:58)
> [GCC 4.7.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> --> import sys
> --> sys.argv
> ['']
> --> sys.argv[1:] = ('this is a test!', )
> --> sys.argv
> ['', 'this is a test!']
> --> ' '.join(sys.argv[1:])
> 'this is a test!'
>
>
> Second, your code doesn't show being joined by an underscore.
>
> --
> ~Ethan~

APOLOGIES to those who responded.

It seems that a change was made in the program between the 3.3 run and 
the other runs.

Each produces the same heading now.

Yes, I should have posted the test code.  But, in these circumstances, 
there is no point in doing that.

Colin W.

Colin W.

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#41705

Colin J. Williams wrote:

> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
> 3.3.0 to compare speeds, both between versions and machines:
> 
> if __name__ == '__main__':
>      # Text string for initial test - Modify for your own machine or
>      # delete it and and answer the input statement with your own machine
>      # characteristics.
>      sys.argv[1:]= ('Intel Pentium D CPU 3.0GHz 1.99 GB of RAM 221GB
> Disk Free space', )
>      main()
> 
> 
> def main():
>      if len(sys.argv) > 1:
>          idMachine= ' '.join(sys.argv[1:])
>      ...
>      oFile= open('FP' + now + '.log', 'w')
>      oFile.writelines(idM + '\n' + sys.version + '\n')
> 
> For 2.7, the result is:
> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
> 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]
> 
> for 3.2, the result is:
> Intel_Pentium_D_CPU_3.0GHz_1.99_GB_of_RAM_221GB_Disk_Free_space
> 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)]
> 
> For 3.3, the result is:
> 
I_n_t_e_l___P_e_n_t_i_u_m___D___C_P_U___3_._0_G_H_z___1_._9_9___G_B___o_f___R_A_M___2_2_1_G_B___D_i_s_k___F_r_e_e___s_p_a_c_e
> 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit
> (Intel)]
> 
> The full test result, for random matrices of increasing order is
> available
> here(http://web.ncf.ca/cjw/FP%20Summary%20over%20273-323-330.txt)

You may have run Python 3.3 with a slightly different script, one where you 
forgot a trailing comma:

>>> argv = ["foo"]
>>> argv[1:] = ("bar",) # with comma
>>> print("-".join(argv[1:]))
bar
>>> argv = ["foo"]
>>> argv[1:] = ("bar") # without comma
>>> print("-".join(argv[1:]))
b-a-r

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#41706

On Fri, 22 Mar 2013 17:57:42 -0400, Colin J. Williams wrote:

> Below is an extract from some code to run on Python 2.7.3, 3.2.3 and
> 3.3.0 to compare speeds, both between versions and machines:

Do you have an actual question? I don't see the point. You've given us an 
"extract", which means the rest of your code could be doing anything, and 
the code you have provided doesn't actually run. What question are we 
supposed to be answering? Is there a problem here that needs to be solved?

I appreciate the fact that you didn't dump a huge blob of code on us, 
truly I do, but please read this page:

http://sscce.org/

for ideas on how to effectively write example code.

By the way, if you suspect a difference in sys.argv, the easiest way to 
compare the two is to *look at sys.argv alone*, with as little other 
confounding code as possible.

E.g. write this tiny two-line script:

import sys
print(sys.argv)


Then call it from the command line with something like this (tested under 
Linux, may be a little different under Windows):


python2.7 myscript.py "hello world" fe fi fo fum
python3.2 myscript.py "hello world" fe fi fo fum
python3.3 myscript.py "hello world" fe fi fo fum


In all three cases, you should get the exact same result:

['hello world', 'fe', 'fi', 'fo', 'fum']


which strongly suggests that whatever problem you are experiencing, it is 
not caused by changes in sys.argv. (There is no change in sys.argv, it's 
just a list of strings, the same as it always was.)



P.S. it's remarkably, and deceptively, difficult to correctly benchmark 
code. The best way is to take your actual application, give it some real 
world data to process, and time how long it takes.


-- 
Steven

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