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From: Neal Becker <ndbecker2@gmail.com>
Subject: why syntax change in lambda
Date: Wed, 11 Sep 2013 09:03:49 -0400
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Xref: csiph.com comp.lang.python:53961

In py2.7 this was accepted, but not in py3.3.  Is this intentional?  It seems to 
violate the 'principle' that extraneous parentheses are usually allowed/ignored

In [1]: p = lambda x: x

In [2]: p = lambda (x): x
  File "<ipython-input-2-2b94675a98f1>", line 1
    p = lambda (x): x
               ^
SyntaxError: invalid syntax