[issue3860] GzipFile and BZ2File should support context manager protocol

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

I love "with ... as f:" and I want it for gzip/bz2 files!

Comment about the patch: 

(1) the IOError message is different for the two modules:
   "I/O operation on closed GzipFile object"
vs
   "I/O operation on closed file"

Specify the object name in both messages or remove it from both 
messages. I prefer verbose error message ("I/O operation on closed 
BZ2File object").

(2) For bz2module, Why don't you call BZ2File_close() directly instead 
of the generic version PyObject_CallMethod(... "close" ...)?

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3860>
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