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Note ExitStack's new-style class requirement

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Nick Coghlan 2016-05-02 15:03:03 +10:00
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@ -310,6 +310,10 @@ Functions and classes provided:
foundation for higher level context managers that manipulate the exit foundation for higher level context managers that manipulate the exit
stack in application specific ways. stack in application specific ways.
Context managers used with :class:`ExitStack` must be new-style classes -
this is the default on Python 3, but requires explicitly inheriting from
:class:`object` or another new-style class in Python 2.
.. versionadded:: 0.4 .. versionadded:: 0.4
Part of the standard library in Python 3.3 and later Part of the standard library in Python 3.3 and later