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From the docs for built-in function "round":
 "If ndigits is omitted, it defaults to zero"
 (http://docs.python.org/3/library/functions.html#round)
But, the only way to get an integer from `round` is by not having the second argument (ndigits):
 >>> round(3.5)
 4
 >>> round(3.5, 1)
 3.5
 >>> round(3.5, 0)
 4.0
 >>> round(3.5, -1)
 0.0
 >>> round(3.5, None)
 Traceback (most recent call last):
 File "<pyshell#6>", line 1, in <module>
 round(3.5, None)
 TypeError: 'NoneType' object cannot be interpreted as an integer
Either the docs are wrong or the behavior is wrong. I think it's easier to fix the former...
But also there should be a way to make round return an integer (e.g. passing `None` as 2nd argument)