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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
        raised when a compile error is found.  If an exception occurs and this
        flag is set to False, a string indicating the nature of the exception
        will be printed, and the function will return to the caller. If an
        exception occurs and this flag is set to True, a PyCompileError
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    :param optimize: The optimization level for the compiler.  Valid values
        are -1, 0, 1 and 2.  A value of -1 means to use the optimization
        level of the current interpreter, as given by -O command line options.

    :return: Path to the resulting byte compiled file.

    Note that it isn't necessary to byte-compile Python modules for
    execution efficiency -- Python itself byte-compiles a module when
    it is loaded, and if it can, writes out the bytecode to the
    corresponding .pyc file.

    However, if a Python installation is shared between users, it is a
    good idea to byte-compile all modules upon installation, since
    other users may not be able to write in the source directories,
    and thus they won't be able to write the .pyc file, and then
    they would be byte-compiling every module each time it is loaded.
    This can slow down program start-up considerably.

    See compileall.py for a script/module that uses this module to
    byte-compile all installed files (or all files in selected
    directories).

    Do note that FileExistsError is raised if cfile ends up pointing at a
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