New submission from Charles Cazabon:
This is a weird one. I've reproduced it with 3 versions of 2.7, including the
latest 2.7.13. I didn't find an open bug about this, but I had difficulty
crafting a search string for it, so I may have missed something.
Basically, using a `with` statement (maybe any such statement, but using an
open file definitely does it, even when I do nothing with it) causes the
built-in dict class to stop raising AttributeErrors, which can result in odd
bugs.
Example:
Python 2.7.13 (default, Apr 25 2017, 10:12:36)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> with sys.stderr as foo:
... pass
...
>>> {}.nosuchattribute
>>> {}.nosuchattribute is None
>>>
I haven't tried the latest 3.x, but it's definitely still there in 3.2.3:
Python 3.2.3 (default, Nov 17 2016, 01:04:00)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> with sys.stderr as foo:
... pass
...
>>> {}.nosuchattribute
>>> {}.nosuchattribute is None
>>>
----------
components: Interpreter Core
messages: 292270
nosy: charlesc
priority: normal
severity: normal
status: open
title: Using `with` statement causes dict to start papering over attribute
errors
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30161>
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