求壹個python計算加減乘除的程序。

class myCalc:

def __init__(self,a,b):

self.a=a

self.b=b

def addition(self,Retain):

return round(self.a + self.b ,Retain)

def subtraction(self,Retain):

return round(self.a - self.b,Retain)

def multiplication(self,Retain):

return round(self.a * self.b,Retain)

def division(self,Retain):

return round(self.a / self.b,Retain)

while True:

get_num1 = input("請輸入第壹個數字：")

opera = input("請輸入運算符：")

get_num2 = input("請輸入第二個數字：")

get_retain = input("請輸入保留小數位數：")

num1 = float(get_num1)

num2 = float(get_num2)

retain = int(get_retain)

result = 0.00

if opera == "+":

result = myCalc(num1,num2).addition(retain)

elif opera == "-":

result = myCalc(num1,num2).subtraction(retain)

elif opera == "*":

result = myCalc(num1,num2).multiplication(retain)

else:

result = myCalc(num1,num2).division(retain)

print("輸出結果是：",result)