On Tue, Apr 17, 2018 at 6:20 PM, Steven D'Aprano <steve@pearwood.info> wrote:
If there are tests which intentionally verify this behaviour, that
really hurts your position that the behaviour is an accident of
implementation. It sounds like the behaviour is intended and required.
It is nonetheless bizarre and unexpected behavior.
>>> prefix = 'global'
>>> [prefix+c for c in 'abc']
['globala', 'globalb', 'globalc']
>>> def func():
... prefix = 'local'
... print([prefix+c for c in 'abc'])
>>> func()
['locala', 'localb', 'localc']
>>> class klass:
... prefix = 'classy'
... items = [prefix+c for c in 'abc']
>>> print(klass.items)
['globala', 'globalb', 'globalc']
In Python 2, that last one would produce 'classya' and friends, due to the "broken" comprehension scope.