Raymond Hettinger added the comment:
What you're seeing is a feature of the grammar.
Function allow an optional trailing comma in the argument list:
>>> pow(2, 5)
32
>>> pow(2, 5,)
32
So, to create a tuple inside in an argument list, you need the extra layer of
parentheses.
Sorry, this isn't a real bug. It is just a conflict resolution between use of
a comma to separate arguments in a function call and use of a comma to create a
tuple.
----------
nosy: +rhettinger
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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<http://bugs.python.org/issue30086>
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