gzip and bz2 are context managers

Doc/library/bz2.rst

@@ -60,6 +60,11 @@ Handling of compressed files is offered by the :class:`BZ2File` class.
    reading. Instances support iteration in the same way as normal :class:`file`
    instances.
 
+   :class:`BZ2File` supports the :keyword:`with` statement.
+
+   .. versionchanged:: 2.7
+      Support for the :keyword:`with` statement was added.
+
 
    .. method:: close()
 

Doc/library/gzip.rst

@@ -67,6 +67,11 @@ The module defines the following items:
    writing as *fileobj*, and retrieve the resulting memory buffer using the
    :class:`StringIO` object's :meth:`getvalue` method.
 
+   :class:`GzipFile` supports the :keyword:`with` statement.
+
+   .. versionchanged:: 2.7
+      Support for the :keyword:`with` statement was added.
+
 
 .. function:: open(filename[, mode[, compresslevel]])