Backwards-compatible input calls in Python

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Since the Python 2.x version of input() is essentially useless, you can simply overwrite it by raw_input:

try:
    input = raw_input
except NameError:
    pass

In general, I would not try to aim at code that works with both, Python 2.x and 3.x, but rather write your code in a way that it works on 2.x and you get a working 3.x version by using the 2to3 script.

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