Run a external program.

[Yasser Almeida Hernández]

So, how can i pass an argument as a variable in this context...?


Quoting MRAB <python at mrabarnett.plus.com>:

> Yasser Almeida Hernández wrote:
>> Hi all!!
>>
>> I'm writing a script where i call a external program which receive   
>> some arguments.
>> One of this arguments is stored in a variable, that is passed as   
>> argument as well:
>>
>> import os
>> ...
>> f = open(file1, 'r')
>> s = 'command $f -i file2 -w 1.4 -o file3.out'
>> os.system(s)
>> ...
>>
>> When i run the script i get the next message...
>> '-i: No such file or directory'
>> ... with a obvious error in the exit of the program. If i remove   
>> the option -i i get the same error with every option, even with   
>> those who don't get any file as argument. (file2 exist).
>> BUT, when i run the external program in a python shell, it works...
>>
>> What's wrong?
>>
> The name 'f' in the Python script exists only in Python and is unrelated
> to the '$f' that the shell sees.
> -- 
> http://mail.python.org/mailman/listinfo/python-list



-- 
Lic. Yasser Almeida Hernández
Center of Molecular Inmunology (CIM)
Nanobiology Group
P.O.Box 16040, Havana, Cuba
Phone: (537) 271-7933, ext. 221

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