New submission from Pablo Galindo Salgado <pablog...@gmail.com>:

There is a non-trivial ammount of users that try to parenthesize lambda 
parameters:

>>> lambda (x,y,z): x+y+z
  File "<stdin>", line 1
    lambda (x,y,z): x+y+z
           ^
SyntaxError: invalid syntax

We should improve the error message in this case

----------
messages: 403747
nosy: pablogsal
priority: normal
severity: normal
status: open
title: Improve syntax error for parenthesized arguments

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45450>
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