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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 _archive_cls(file, ext=''):
 """ Return the proper Archive implementation class, based on the file type. """

        cls = None
        filename = None
        if is_string(file):
            filename = file
        else:
            try:
                filename = file.name
            except AttributeError:
                raise UnrecognizedArchiveFormat(
                    "File object not a recognized archive format.")
        lookup_filename = filename + ext
        base, tail_ext = os.path.splitext(lookup_filename.lower())
        cls = extension_map.get(tail_ext)
        if not cls:
            base, ext = os.path.splitext(base)
            cls = extension_map.get(ext)
        if not cls:
            raise UnrecognizedArchiveFormat(
                "Path not a recognized archive format: %s" % filename)
        return cls