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I have a very big project going on with python. And i need to get script what opens another .py file. I have tried to use script like this:

os.system("example.py arg")

And it if the script in file is small like function print or something. But if they are long or something they don't work ! So i need a script that really works and opens the .py file in command promt. Thank you very much !

user1994934
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    Is should always work. Probably the problem is in your example.py file, but I can't help you without more information about the issue. – iurisilvio Jan 21 '13 at 14:38
  • Why not use `import`? If you're trying to use a function from another file, `import` will work. – Rushy Panchal Jan 21 '13 at 14:47
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    @iurisilvio I couldn't put more information about the issue because i had formatting problems when adding script in comment. And the problem in example.py was that i didn't have shebang. Thanks to Rashan Gandi , i now have. – user1994934 Jan 21 '13 at 15:40

2 Answers2

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Running a script using 

os.system("example.py arg")

requires

  • the script must be executable (+x bit)
  • the must contain the shebang "#!/usr/bin/python" at the beginning of the script

See also Should I put #! (shebang) in Python scripts, and what form should it take?

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If you are trying to get a function from another file, you can use import.

from example import my_funct # not that 'example' does NOT have '.py' following it
my_funct() # you can now use the function from the file.

Alternatively, you can just import the whole script:

import example
example.my_funct() # you have to specify that 'my_funct' is from 'example'

Or, you can do:

from example import * # this imports all functions from 'example'
my_funct() # now you can use the function as you normally would

NOTE: To import a function from a module, you need to have it set up correctly. This is how you add a function to your PYTHONPATH.

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Rushy Panchal
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