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(python2.1-tut.info)Argument Passing

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Argument Passing
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When known to the interpreter, the script name and additional arguments
thereafter are passed to the script in the variable `sys.argv', which
is a list of strings.  Its length is at least one; when no script and
no arguments are given, `sys.argv[0]' is an empty string.  When the
script name is given as `'-'' (meaning standard input), `sys.argv[0]'
is set to `'-''.  When `-c' COMMAND is used, `sys.argv[0]' is set to
`'-c''.  Options found after `-c' COMMAND are not consumed by the
Python interpreter's option processing but left in `sys.argv' for the
command to handle.