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1》内置函数pow()

>>> help(pow)Help on built-in function pow in module __builtin__:pow(...)    pow(x, y[, z]) -> number    With two arguments, equivalent to x**y.  With three arguments,    equivalent to (x**y) % z, but may be more efficient (e.g. for longs).>>> >>> pow(3,2)  # 3**29>>> pow(3,2,4)# (3**2)%41

>>> import math>>> help(math.pow)Help on built-in function pow in module math:pow(...)    pow(x, y)    Return x**y (x to the power of y).>>> math.pow(3,2)9.0>>>

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