Eryk Sun added the comment:
In Python 2, using the exec statement makes the compiler disable fast locals:
>>> def foo(): pass
...
>>> def bar(): exec ''
...
>>> foo.__code__.co_flags & inspect.CO_OPTIMIZED
1
>>> bar.__code__.co_flags & inspect.CO_OPTIMIZED
0
This has never been the case in Python 3, in which exec() is a function instead
of a statement. The exec function can be shadowed by a global named "exec", so
the hack to disable fast locals was removed.
----------
nosy: +eryksun
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26825>
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