Python定义一个分数类，分别完成分数的加减乘除

目标：定义分数类，使两个分数可以进行加减乘除等操作

代码实现：

class Fraction1:
    def __init__(self,up,down):
        self.up = up
        self.down = down
    def __str__(self):
        return str(self.up)+"/"+str(self.down)
    def add(self,other):
        up1 = self.up * other.down + self.down * other.up
        down1 = self.down * other.down
        return Fractionl(up1,down1)  # add
    def sub(self,other):
        up1 = self.up * other.down - self.down * other.up
        down1 = self.down * other.down
        return Fraction1(up1,down1)  # subtract
    def multi(self,other):
        up1 = self.up * other.up
        down1 = self.down * other.down
        return Fraction1(up1,down1)  # multi
    def div(self,other):
        up1 = self.up * other.down
        down1 = self.down * other.up
        return Fraction1(up1,down1)  # div

创建对象并调用类中”加法“构造函数

f1 = Fraction1(1,2)
f2 = Fraction1(1,3)
print(f1,f2,f1.add(f2))  #输出结果结构为数1、数2、数1+数2

结果展示：

创建对象并调用类中”减法“构造函数

f1 = Fraction1(1,2)
f2 = Fraction1(1,3)
print(f1,f2,f1.sub(f2))  #输出结果结构为数1、数2、数1-数2

结果展示：

创建对象并调用类中”乘法“构造函数

f1 = Fraction1(1,2)
f2 = Fraction1(1,3)
print(f1,f2,f1.multi(f2))

结果展示：

创建对象并调用类中”除法“构造函数 

f1 = Fraction1(1,2)
f2 = Fraction1(1,3)
print(f1,f2,f1.div(f2))

结果展示：