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    :param dfile: Purported file name, i.e. the file name that shows up in
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    :param doraise: Flag indicating whether or not an exception should be
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    :param optimize: The optimization level for the compiler.  Valid values
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    :return: Path to the resulting byte compiled file.

    Note that it isn't necessary to byte-compile Python modules for
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    However, if a Python installation is shared between users, it is a
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    other users may not be able to write in the source directories,
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    This can slow down program start-up considerably.

    See compileall.py for a script/module that uses this module to
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    Do note that FileExistsError is raised if cfile ends up pointing at a
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