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This module helps scripts to parse the command line arguments in
sys.argv.  It supports the same conventions as the Unix getopt()
function (including the special meanings of arguments of the form `-'
and `--').  Long options similar to those supported by GNU software
may be used as well via an optional third argument.  This module
provides two functions and an exception:

getopt() -- Parse command line options
gnu_getopt() -- Like getopt(), but allow option and non-option arguments
to be intermixed.
GetoptError -- exception (class) raised with 'opt' attribute, which is the
option involved with the exception.
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Parses command line options and parameter list.  args is the
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    long options which should be supported.  The leading '--'
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The return value consists of two elements: the first is a list of
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    left after the option list was stripped (this is a trailing slice
    of the first argument).  Each option-and-value pair returned has
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    '-x'), and the option argument as its second element, or an empty
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    list in the same order in which they were found, thus allowing
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This function works like getopt(), except that GNU style scanning
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    processing options as soon as a non-option argument is
    encountered.

If the first character of the option string is `+', or if the
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    processing stops as soon as a non-option argument is encountered.

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