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There are some exceptions to this - for example, the iteration variable(s) in a list comprehension are only in scope within the comprehension.
by pansa2 6y ago
There are some exceptions to this - for example, the iteration variable(s) in a list comprehension are only in scope within the comprehension.
- pdw 6y agoThanks, I didn't realize that. That makes their choice really baffling.
- _nosewings_ 6y agoThe explanation is that (in Python 3) list comprehensions are really just syntactic sugar for generator expressions. In Python, "scope" is really a synonym for "dictionary attached to some object", so generators can have local variables (since they have their own internal scope), but purely syntactic constructs cannot.
- amirkdv 6y agoWorth noting that this was _fixed_ in Python 3. In Python 2.7 you get this: >>> my_list = [x for x in 'hello'] >>> x 'o'