fnmatch.py 文件源码

def filter(filenames, pattern):
        filtered_filenames = []

        pattern = os.path.normcase(pattern)
        cached_pattern = _get_cached_pattern(pattern)

        if os.path is posixpath:
            # normcase on posix is NOP. Optimize it away from the loop.
            for filename in filenames:
                if cached_pattern.match(filename):
                    filtered_filenames.append(filename)
        else:
            for filename in filenames:
                norm_name = os.path.normcase(filename)
                if cached_pattern.match(norm_name):
                    filtered_filenames.append(filename)

        return filtered_filenames