anti_lib.py 文件源码

def __init__(self, N=2, D=None):
        if D is None:
            D = 1
        if N < 0:
            N *= -1
            D *= -1
        if N < 2:
            raise ValueError('fraction numerator is less than 2')

        D %= N
        if D == 0:
            raise ValueError('fraction denominator is a multiple '
                             'of the numerator')
        self.parts = fractions.gcd(N, D)
        self.N = N // self.parts
        self.D = D // self.parts