Create an archive file (such as zip or tar) and return its name.
*base_name* is the name of the file to create, including the path, minus
- any format-specific extension. *format* is the archive format: one of
+ any format-specific extension.
+
+ *format* is the archive format: one of
"zip" (if the :mod:`zlib` module is available), "tar", "gztar" (if the
:mod:`zlib` module is available), "bztar" (if the :mod:`bz2` module is
available), or "xztar" (if the :mod:`lzma` module is available).