Serhiy Storchaka added the comment:
set(x for x in range(2),) can be interpreted as set(x for x in (range(2),)).
Wouldn't be better to forbid such ambiguous syntax? The trailing comma in
argument list is supported because it helps to add new arguments (or temporary
comment out arguments).
foo(x,
y,
#z,
)
But set(x for x in range(2),) is not syntactically valid if add an argument
after the comma. Parenthesis around a generator expression can be omitted only
if it is the only argument in a function call. I think that it would be better
to forbid a trailing comma in this case.
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nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue27494>
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