[Python-Dev] Informal educator feedback on PEP 572 (was Re: 2018 Python Language Summit coverage, last part)
greg.ewing at canterbury.ac.nz
Wed Jun 27 09:38:54 EDT 2018
Nick Coghlan wrote:
> actually made those semantics available as an explicit
> "parentlocal NAME" declaration ...:
> def _list_comp(_outermost_iter):
> parentlocal item
> _result = 
> for x in _outermost_iter:
> item = x
> return _result
> _expr_result = _list_comp(items)
I'm not sure that's possible. If I understand correctly,
part of the definition of "parent local" is that "parent"
refers to the nearest enclosing *non-comprehension* scope,
to give the expected result for nested comprehensions.
If that's so, then it's impossible to fully decouple its
definition from comprehensions.
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