I want to determine if a list contains a certain string, so I use a generator expression, like so:

g = (s for s in myList if s == myString)
any(g)

Of course I want to inline this, so I do:

any((s for s in myList if s == myString))

Then I think it would look nicer with single parens, so I try:

any(s for s in myList if s == myString)

not really expecting it work. Surprise! it does!

So is this legal Python or just something my implementation allows? If it's legal, what is the general rule here?

python parentheses generator-expression
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