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PEP 640: Add clarification (#1662)

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T. Wouters 2020-10-19 14:58:10 -07:00 committed by GitHub
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@ -132,6 +132,8 @@ Backwards Compatibility
Introducing a new token means there are no backward compatibility concerns. Introducing a new token means there are no backward compatibility concerns.
No valid syntax changes meaning. No valid syntax changes meaning.
"?" is not considered an identifier, so str.isidentifier() does not change.
The AST does change in an incompatible way, as the identifier of a Name The AST does change in an incompatible way, as the identifier of a Name
token can now be empty. Code using the AST will have to be adjusted token can now be empty. Code using the AST will have to be adjusted
accordingly. accordingly.