docstring for math.fmod has been changed: C:\Code\python\dist\src\PCbuild>python Python 2.0b1 (#5, Sep 9 2000, 20:53:30) [MSC 32 bit (Intel)] on win32 Type "copyright", "credits" or "license" for more information. >>> import math >>> print math.fmod.__doc__ fmod(x,y) Return fmod(x, y), according to platform C. x % y may differ. >>>