tarfile.py 文件源码

def gzopen(cls, name, mode="r", fileobj=None, compresslevel=9, **kwargs):
        """Open gzip compressed tar archive name for reading or writing.
           Appending is not allowed.
        """
        if len(mode) > 1 or mode not in "rw":
            raise ValueError("mode must be 'r' or 'w'")

        try:
            import gzip
            gzip.GzipFile
        except (ImportError, AttributeError):
            raise CompressionError("gzip module is not available")

        try:
            t = cls.taropen(name, mode,
                gzip.GzipFile(name, mode + "b", compresslevel, fileobj),
                **kwargs)
        except IOError:
            raise ReadError("not a gzip file")
        t._extfileobj = False
        return t