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PEP-563: Fixed a nested class example (#2007) 

The "Backward Compatibility" section in PEP-563 contains an example which
violates Python scoping rules. This PR updates the PEP to say that the example
is not OK and should fail.

See discussion in typing-sig for details [*].

[*]: https://mail.python.org/archives/list/typing-sig@python.org/thread/F2ERQCGB6W6VADR7G6NN4TLMFJECD6EW/
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Sergei Lebedev 2021-06-28 19:14:44 +01:00 committed by GitHub
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@ -259,14 +259,15 @@ valid. They can use local names or the fully qualified name. Example::
def method(self) -> C.D.field2: # this is OK def method(self) -> C.D.field2: # this is OK
... ...
def method(self) -> D.field2: # this is OK def method(self) -> D.field2: # this FAILS, class D is local to C
... ... # and is therefore only available
# as C.D.
def method(self) -> field2: # this is OK def method(self) -> field2: # this is OK
... ...
def method(self) -> field: # this FAILS, class D doesn't def method(self) -> field: # this FAILS, class D doesn't
... # see C's attributes, This was ... # see C's attributes. This was
# already true before this PEP. # already true before this PEP.
In the presence of an annotation that isn't a syntactically valid In the presence of an annotation that isn't a syntactically valid