如何查看python内置函数源码

def expovariate(self, lambd):

        """Exponential distribution.

        lambd is 1.0 divided by the desired mean.  It should be

        nonzero.  (The parameter would be called "lambda", but that is

        a reserved word in Python.)  Returned values range from 0 to

        positive infinity if lambd is positive, and from negative

        infinity to 0 if lambd is negative.

        """

        # lambd: rate lambd = 1/mean

        # ('lambda' is a Python reserved word)

        # we use 1-random() instead of random() to preclude the

        # possibility of taking the log of zero.

        return -_log(1.0 - self.random())/lambd