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Python3 doesn’t support tuple as a parameter in a function

If you are trying to convert some Python2 code to Python3 and running into syntax error like this:

% python3
File “”, line 2
def f1 (a, (b,c)):
SyntaxError: invalid syntax

that is because Python3 does not support tuple as a parameter in a function.

You can see the reason and how to work around this error here:

PEP 3113 — Removal of Tuple Parameter Unpacking

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