Raymond Hettinger added the comment:
I'm not sure a semantically neutral automatic fix is possible:
f = lambda (a, b), c: a + b + c # Py2.x
f = lambda t, c: t[0] + t[1] + c # Py3.x
The former will unpack any iterable, not just sequences:
>>> def g():
yield 'a'
yield 'b'
>>> f(g(), 'c')
'abc'
Also, the former will validate the number of arguments:
>>> f((1,2,3), 4)
Traceback (most recent call last):
File "<pyshell#11>", line 1, in <module>
f((1,2,3), 4)
File "<pyshell#0>", line 1, in <lambda>
f = lambda (a, b), c: a + b + c
ValueError: too many values to unpack
I don't see a way to automatically include those capabilities in an automatic
2-to-3 transformation.
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nosy: +rhettinger
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<http://bugs.python.org/issue16094>
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