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Provides the Command class, the base class for the command classes
in the distutils.command package.
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    final values, aka "finalized") in 'finalize_options()', both of which
    must be defined by every command class.  The distinction between the
    two is necessary because option values might come from the outside
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    other options must be computed *after* these outside influences have
    been processed -- hence 'finalize_options()'.  The "body" of the
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