Eric V. Smith <e...@trueblade.com> added the comment:
The fact that adding := support could break existing working code does give me pause to make any change here, and does suggest that a deprecation period would be needed in order to modify the f-string expression scanning behavior. One concern I have is that if something akin to PEP 536 is used to implement f-strings, then it would require some work (but not be impossible) to avoid allowing :=. In 3.8, := is prohibited in "expression as a statement" mode, but that's not the mode that f-strings expressions operate in: they're just normal expressions, and I would normally just expect := to work. But the backward compatibility break here is the reason to possibly disallow supporting :=, not that := should just never work in f-strings without parens. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36798> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
