小编Gol*_*Man的帖子

所以我最近开始用Python进行面向对象编程,对于一个特定的问题,我必须编写一个处理分数的类.通过减法和加法等常用数学运算符的编写方法,一切似乎都很顺利; 但是,我坚持使用递归方法.

class fractions():
    def __init__(self, numerator, denominator):
        self.numerator = numerator
        self.denominator = denominator
    def GreatestCommonDivisor(self, numerator, denominator): # This is the culprit
        if numerator%denominator == 0:
            return denominator
        else:
            return GreatestCommonDivisor(self, denominator, numerator%denominator)

当我用另一种需要找到分子最大除数的方法调用最大公约数函数时,我得到:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Wing IDE 101 3.2\src\debug\tserver\_sandbox.py", line 1, in <module>
    # Used internally for debug sandbox under external interpreter
  File "C:\Program Files (x86)\Wing IDE 101 3.2\src\debug\tserver\_sandbox.py", line 9, in GreatestCommonDivisor
NameError: global name 'GreatestCommonDivisor' is not defined 

我把这个函数称为:

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