Question

我有一个应该简化分数的代码。但我无法正确创建简化方法。

class Fraction:
    """ This class represents one single fraction that consists of
        numerator and denominator """

    def __init__(self, numerator, denominator):
        """
        Constructor. Checks that the numerator and denominator are of
        correct type and initializes them.

        :param numerator: fraction's numerator
        :param denominator: fraction's denominator
        """

        if not isinstance(numerator, int) or not isinstance(denominator, int):
            raise TypeError
        elif denominator == 0:
            raise ValueError

        self.__numerator = numerator
        self.__denominator = denominator

    def return_string(self):
        """ Returns a string-presentation of the fraction in the format
        numerator/denominator """

        if self.__numerator * self.__denominator < 0:
            sign = "-"
        else:
            sign = ""
        return "{:s}{:d}/{:d}".format(sign, abs(self.__numerator),
                                     abs(self.__denominator))

    def simplify(self):
        """ simplify fraction """


def greatest_common_divisor(a, b):
    """
    Euclidean algorithm.
    """

    while b != 0:
        a, b = b, a % b
    return a

应该给出

>>> frac = Fraction(-2, -4)
>>> frac.return_string()
'2/4'
>>> frac.simplify()
>>> frac.return_string()
'1/2'

所以基本上我有创建简化方法的问题。我也知道你可以输入分数，但我不需要那个。

Answer 1

分数模块可以简化分数。

>>> from fractions import Fraction
>>> Fraction(120, 35)
Fraction(24, 7)

如果您想了解更多信息，请查看Does Python have a function to reduce fractions?。

Python - 如何简化分数

1 个答案: