Johannes Bauer <dfnsonfsdu...@gmx.de> writes:
> On 30.03.2018 13:13, Ben Bacarisse wrote:
>
>>> import collections
>>>
>>> class Test(object):
>>> def __init__(self):
>>> z = {
>>> "y": collections.defaultdict(list),
>>
>> This mention of collections refers to ...
>>
>>> }
>>> for (_, collections) in z.items():
>>
>> ... this local variable.
>
> Yup, but why? I mean, at the point of definition of "z", the only
> definition of "collections" that would be visible to the code would be
> the globally imported module, would it not? How can the code know of the
> local declaration that only comes *after*?
Why questions can be hard. The language definition says what's supposed
to happen. Is that enough of an answer to why?
4.2.2. Resolution of names
A scope defines the visibility of a name within a block. If a local
variable is defined in a block, its scope includes that block. [...]
<snip>
--
Ben.
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