cmdcall.py: Call Python functions from the command line

This is an easy way to be able to call multiple functions from the same Python file from the command line. It does not require changes to those functions, or the use of argparse or something similar.

Here is an example.

import cmdcall

@cmdcall.command(float, float)
def add(a, b):
    print a + b

@cmdcall.command(int, int)
def multiply(a, b):
    print a*b

if __name__ == '__main__':
    cmdcall.main()

If this script were named math.py, you can now do python math.py add 55.5 66.6 or python math.py multiply 7 -2.

For general use, simply decorate functions with @cmdcall.command(argument types...) and add a call to cmdcall.main() in your script.

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The closest existing thing I could find was this code, but I think this is cleaner and doesn't require any change to code inside your functions.