Message 148959 - Python tracker

>>> f((yield))

This requirement seems unnecessary. And surprising, because f(<generator-expression>) or f('a' if 'a' else 'b') doesn't require parenthes. There's no room for confusion if parentheses were omitted in the single-argument case. (Following the rule given in documentation for generator expressions: "The parentheses can be omitted on calls with only one argument.").