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python - Python分数类和菜单选项

问题描述

我正在制作一个具有可在菜单选项中调用的函数的类，供用户选择诸如添加分数之类的操作。我试图在菜单选项中调用诸如 def__add__(self, other) 之类的函数，但它不起作用。如何从类分数中调用这些函数？是 self.add() 吗？


def gcd(a,b):
    if a == 0:
        return b
    else:
        return gcd(b % a, a)

c = gcd(15,21)
print (c)

class fraction:
    def __init__ (self, numerator, denominator):
        gcd = hcf(numerator, denominator)
        self.top = numerator/gcd
        self.bottom = denominator/gcd
        
    def __str__(self):
        if self.bottom == 1:
            return str(self.top)
        elif self.top > self.bottom:
           return str(self.top//self.bottom) +str(fraction(self.top % self.bottom,self.bottom ))
        
        else:
            return str(self.top) + "/ " + str(self.bottom)
        
    def __add__(self, other):
        newTop = self.top + other.bottom + other.top * self.bottom 
        newBottom = self.bottom + other.bottom 
        return fraction(newTop, newBottom)
    
    def multiply(self):
        return fraction(2*self.top, self.bottom)
        
    def multiply_by(self, n):
        return fraction(n * self.top, self.bottom)
        
    def __sub__(self,other):
        newTop = self.top - other.bottom - other.top * self.bottom
        newBottom = self.bottom - other.bottom 
        return fraction(newTop, newBottom)
    
    def __mul__(self,other):
        newTop = self.top * other.top
        newBottom = self.bottom * other.bottom
        return fraction(newTop, newBottom)
        
    def __div__(self, other):
        pass
    
    def menu(self):
        print("[1] Add two fractions")
        print("[2] Subtract two fractions")
        print("[3] Multiply two fractions")
        print("[4] Divide two fractions")
        print("[5] Add fraction to integer")
        print("[6] Fraction subtract integer")
        print ("[7] Fraction multiply by integer")
        print ("[8] Fraction divided by integer")
        print("[q] Exit program")
    
    #menu()     
    option = input("Enter your option: ")

    while option!= 'q':
        if option == "1":
          #  a = fraction(15,21)
            self.add(3,4) #call add function
            print("option 1 has been called ")
        elif option == 2:
            #do stuff
            print( "option 2 has been called")
        elif option == 3:
            #do stuff
            print("option 3 has been called")
        elif option ==4:
            #do stuff 
            print("option 4 has been called")
        elif option == 5:
            #do stuff 
            print("option 5 has been called")
        else:
            print("Invalid option")
            
        print()
        menu()
        option = input("Enter your option: ")
        
    
    
a = fraction(4,27)
print(a.multiply())
print(a.multiply_by(7))

print(a + fraction(2,7))
print(fraction(1,2) * fraction(3,7))

`

标签： pythonfunctionclass

解决方案

您可以发布具体不起作用的内容吗？

我不确定您的“添加”功能是否正确（您不想添加“顶部”并乘以“底部”吗？），但您只需使用“+”号即可使用该功能，所以如果您具有正确的功能，这应该可以正常工作：

print(a + fraction(2,7))

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