merge 3.4

diff --cc Doc/library/urllib.request.rst
index 07928eda2d3601a07bcd65031964f5ee2462e6b7,bd7340becd305f70badc701bb98ca06c4c019bc1..9de8dd38018a3b2bfd07c90d95c52d42fe7e91b6
--- 1/Doc/library/urllib.request.rst
--- 2/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@@ -115,9 -115,9 +115,10 @@@ The :mod:`urllib.request` module define
     .. versionchanged:: 3.3
        *cadefault* was added.
  
 -   .. versionchanged:: 3.4.3
 +   .. versionchanged:: 3.5
        *context* was added.
  
++
  .. function:: install_opener(opener)
  
     Install an :class:`OpenerDirector` instance as the default global opener.