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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_function_commands(module):
 # type: (ast.Module) -> typing.Generator[_EntryPoint, None, None] """Yield all Command objects represented by python functions in the module. Function commands consist of all top-level functions that contain docopt-style docstrings. Args: module: An ast.Module object used to retrieve docopt-style commands. Yields: Command objects that represent entry points to append to setup.py. """

    nodes = (n for n in module.body if isinstance(n, ast.FunctionDef))
    for func in nodes:
        docstring = ast.get_docstring(func)
        for commands, _ in usage.parse_commands(docstring):
            yield _EntryPoint(commands[0], next(iter(commands[1:]), None),
                              func.name)