List comprehension + lambdas - strange behaviour

[Artur Siekielski]

Hello.
I found this strange behaviour of lambdas, closures and list
comprehensions:

>>> funs = [lambda: x for x in range(5)]
>>> [f() for f in funs]
[4, 4, 4, 4, 4]

Of course I was expecting the list [0, 1, 2, 3, 4] as the result. The
'x' was bound to the final value of 'range(5)' expression for ALL
defined functions. Can you explain this? Is this only counterintuitive
example or an error in CPython?


Regards,
Artur