Change in Python 3.3 with the treatment of sys.argv

Colin J. Williams cjw at ncf.ca
Sat Mar 23 13:27:28 CET 2013


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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