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Division and real division
>>> 1/2 0 >>> from __future__ import division >>> 1/2 0.5
>>> 1//2
0
Comparison
>>> 1 > 2 > 3 False >>> 3 > 2 > 1 True >>> cmp(1,4) -1
Numericla factory functions
>>> bool(0) False >>> bool(‘0‘) True >>> int(‘12332‘) 12332 >>> int(‘0xfff‘, base=16) 4095 >>> long(‘0xffffffff‘, base=16) 4294967295L >>> float(‘1.23333‘) 1.23333 >>> float(123) 123.0
>>> complex(1,2)
(1+2j)
Coerce()
>>> help(coerce) Help on built-in function coerce in module __builtin__: coerce(...) coerce(x, y) -> (x1, y1) Return a tuple consisting of the two numeric arguments converted to a common type, using the same rules as used by arithmetic operations. If coercion is not possible, raise TypeError.
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原文地址:http://www.cnblogs.com/ch3cooh/p/python-arithmetic.html