我的python计算器给出了无效的语法错误

Question

I can't get my calculator to work. when I run it, it says that y elif statement is invallid, functions are above this clode block, it should work.

choice = raw_input("chose an operator [1,2,3,4]")
num1 = raw_input("input number 1")
num2 = raw_input("input number 2")

if choice == 1:
    print(num1,"+",num2,"=",add(num1,num2)

elif choice == 2:
    print(num1,"-",num2,"=",minus(num1,num2)

elif choice == 3:
    print(num1,"x",num2,"=",times(num1,num2)

elif choice == 4:
    print(num1,"/",num2,"=",divide(num1,num2)
else:
    print("that's not a valid operator")

and here is my error

  File "calculator.py", line 27
    elif choice == 2:

Answer 1

您没有在除最后一个语句之外的所有打印语句中关闭) 。

Answer 2

You are missing a ) on each line

if choice == 1:
    print(num1,"+",num2,"=",add(num1,num2)   # <--- needs ) to close

Note: raw_input "asks" for a string value, in your case you should change

if choice == 1:    

to

if choice == "1":

otherwise just use input

ex:

choice = input("chose an operator [1,2,3,4]:\n")  # <- added \n, puts a new line at that point