    def _iter_module_files():
        """Iterator to module's source filename of sys.modules (built-in
        excluded).
        """
        for module in list(sys.modules.values()):
            filename = getattr(module, '__file__', None)
            if filename:
                if filename[-4:] in ('.pyo', '.pyc'):
                    filename = filename[:-1]
                yield filename
Iterator to module's source filename of sys.modules (built-in
excluded).
biliup/common/reload.py