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Georg Brandl committed 9524e14

Use the platform-independent way of calling a script from the shell: "python prog.py", not "prog.py"

Found by Micheal Wells on docs@.

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Doc/library/argparse.rst

 Assuming the Python code above is saved into a file called ``prog.py``, it can
 be run at the command line and provides useful help messages::
 
-   $ prog.py -h
+   $ python prog.py -h
    usage: prog.py [-h] [--sum] N [N ...]
 
    Process some integers.
 When run with the appropriate arguments, it prints either the sum or the max of
 the command-line integers::
 
-   $ prog.py 1 2 3 4
+   $ python prog.py 1 2 3 4
    4
 
-   $ prog.py 1 2 3 4 --sum
+   $ python prog.py 1 2 3 4 --sum
    10
 
 If invalid arguments are passed in, it will issue an error::
 
-   $ prog.py a b c
+   $ python prog.py a b c
    usage: prog.py [-h] [--sum] N [N ...]
    prog.py: error: argument N: invalid int value: 'a'