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Showing content from https://mail.python.org/pipermail/python-dev/2008-March/078285.html below:

[Python-Dev] Removing callable() from the stdlib

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I've been running 2to3's fix_callable over 2.6's stdlib to remove -3
warnings due to callable() usage; 2to3 replaces callable(x) with
has_attr(x, "__call__"). Unfortunately, this breaks code that wants to
run callable() on old-style classes (like test_builtin), because
old-style classes don't have a __call__ attribute (new-style classes
do, however).

How should this be handled? I'm tempted to just add __call__ to
old-style classes for 2.6, but Neal Norwitz thought that might break
some user code. Any other thoughts?

Collin Winter

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