Issue #20875: Merge from 3.3

diff --cc Lib/gzip.py
Simple merge

diff --cc Lib/test/test_gzip.py
Simple merge

diff --cc Misc/NEWS
index 4f7328cc22f893e514c6b563561fbc283cd1bf56,7baa0f7df529ba15dcbe4f8bc47867138beae530..68cb3790abbe3d15fd69aeaef1ab1a293a9c1c72
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -20,10 -13,9 +20,13 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #20875: Prevent possible gzip "'read' is not defined" NameError.
+   Patch by Claudiu Popa.
+ 
 +- Issue #11558: ``email.message.Message.attach`` now returns a more
 +  useful error message if ``attach`` is called on a message for which
 +  ``is_multipart`` is False.
 +
  - Issue #20283: RE pattern methods now accept the string keyword parameters
    as documented.  The pattern and source keyword parameters are left as
    deprecated aliases.