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[Python-Dev] cpython: Closes issue 17467. Add readline and readlines support to

Michael Foord fuzzyman at voidspace.org.uk
Wed Mar 20 05:44:15 CET 2013 
On 19 Mar 2013, at 17:26, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Wed, 20 Mar 2013 01:22:58 +0100 (CET)
> michael.foord <python-checkins at python.org> wrote:
>> http://hg.python.org/cpython/rev/684b75600fa9
>> changeset:   82811:684b75600fa9
>> user:        Michael Foord <michael at voidspace.org.uk>
>> date:        Tue Mar 19 17:22:51 2013 -0700
>> summary:
>>  Closes issue 17467. Add readline and readlines support to unittest.mock.mock_open
> 
> Wasn't it possible to re-use an existing implementation (such as
> TextIOBase or StringIO) rather than re-write your own?
> 
> (it's not even obvious your implementation is correct, BTW. How about
> universal newlines?)

mock_open makes it easy to put a StringIO in place if that's what you want. It's just a simple helper function for providing some known data *along with the Mock api* to make asserts that it was used correctly. It isn't presenting a full file-system. My suggestion to the implementor of the patch was that read / readline / readlines be disconnected - but the patch provided allows them to be interleaved and I saw no reason to undo that.

If users want more complex behaviour (like universal newline support) they can use mock_open along with a StringIO.

Michael


> 
> Regards
> 
> Antoine.
> 
> 
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