使用输入读取数据时的语法错误（）

Question

我一直在尝试在python GUI上编写一个简单的计算器，但我收到了语法错误消息。我是编程新手，所以我不确定是什么。

Traceback (most recent call last): 
    File "C:\Users\kmart3223\Desktop\Martinez_K_Lab1.py", line 126, in <module> 
    main() 
    File "C:\Users\kmart3223\Desktop\Martinez_K_Lab1.py", line 111, in main 
    operation = input("What operations should we do (+, -, /, *):") 
    File "<string>", line 1 
    + 
    ^
SyntaxError: unexpected EOF while parsing 

代码

def main(): 
    operation = input("What operations should we do (+, -, /, *):") 
    if(operation != '+' and operation != '-' and operation != '/' and operation != '*'): 
     print ("chose an operation") 
    else: 
     variable1 = int(input("Enter digits")) 
     variable2 = int(input("Enter other digits")) 
     if (operation == "+"): 
      print (add(variable1, variable2)) 
     elif (operation == "-"): 
      print (sub(variable1, variable2)) 
     elif (operaion == "*"): 
      print (mul(variable1, variable2)) 
     else: 
      print (div(variable1, variable2)) 
main() 

Answer 1

代替input()

input()使用raw_input()解释你作为一个Python表达式中输入的数据。另一方面，raw_input()返回您输入的字符串。

Answer 2

如果你使用python 2X使用raw_input()

>>> input()   # only takes python expression 
>>> input() 
+ 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "<string>", line 1 
    + 
    ^
SyntaxError: unexpected EOF while parsing 
>>> input() 
'+'     # string ok 
'+' 
>>> input() 
7     # integer ok 
7 
>>> raw_input()    # Takes input as string 
+ 
'+'