此python代码中存在错误

这是我在Python2.7中创建的代码，但它不起作用。我想有个缩进错误。你能帮我吗？

按照如下所示，在每个

if语句后面添加一个冒号，并将
user\u input==input（'：'）
更改为
user\u input=input（'：'））
：

编辑：

下面是一个更好的代码版本，它修复了一些错误，比如读取字符串输入、避免被零除异常和删除
float（）
类型转换，因为在python 2.7
input（）
中已经为您做了这些

while True:
    print ("Options")
    print ("Write 'Quit' if you want to exit")
    print ("Write '+'if you want to make an addition")
    print ("Write '-' if you want to make a sottration")
    print ("Write '*' if you want to make a moltiplication")
    print ("Write '/' if you wantto make a division")
    user_input = input(":") # fix this line
    if user_input == ("+"):
        num1 = float(input("Enter a number..."))
        num2 = float(input("Enter the second number..."))
        result = str(num1+num2)
        print("The result is"+ result)
    elif user_input == ("-"):
        num1 = float(input("Enter a number..."))  
        num2 = float(input("Enter the second number..."))
        result = str(num1-num2)
        print("The result is"+ result)
    elif user_input == ("*"):
        num1 = float(input("Enter a number..."))
        num2 = float(input("Enter the second number..."))
        result = str(num1*num2)
        print("The result is"+ result)
    elif user_input == ("/"):
        num1 = float(input("Enter a number..."))
        num2 = float(input("Enter the second number..."))
        result = str(num1/num2)
        print ("The result is"+ result)

正如其他用户所建议的，这里还有一个改进版本：

while True:
    print("Options")
    print("Write 'Quit' if you want to exit")
    print("Write '+'if you want to make an addition")
    print("Write '-' if you want to make a sottration")
    print("Write '*' if you want to make a moltiplication")
    print("Write '/' if you wantto make a division")
    user_input = raw_input(":")
    if user_input == '+':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1+num2))
    elif user_input == '-':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1-num2))
    elif user_input == '*':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1*num2))
    elif user_input == '/':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        if num2 == 0:
            print("Can't divide by zero.")
        else:
            print("The result is {}".format(num1/num2))

是的，这是一个
缩进错误
（但也是一个
语法错误
，因为您忘记了
：
在
if
条件之后）。您缩进的代码是否与问题中所示完全相同？是什么让您认为缩进错误使其“无法运行”？你做了什么来修复它？考虑看介绍Python教程。这肯定会有帮助的。为我的错误感到抱歉，我是一名意大利学生，我正在学习这种编程语言……为什么不把重复的“输入一个数字…”放在elif之外呢？将节省6行！如果你这样做，我会投票：我想你也需要使用
原始输入。问题说明使用了python-2.7。我将重新编写它，而不是我解决的OP代码的编辑版本，非常感谢：-）对不起我的错误，我是一名意大利学生，我正在学习这种编程语言。。。
while True:
    print("Options")
    print("Write 'Quit' if you want to exit")
    print("Write '+'if you want to make an addition")
    print("Write '-' if you want to make a sottration")
    print("Write '*' if you want to make a moltiplication")
    print("Write '/' if you wantto make a division")
    user_input = raw_input(":")
    if user_input == '+':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1+num2))
    elif user_input == '-':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1-num2))
    elif user_input == '*':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        print('The result is {}'.format(num1*num2))
    elif user_input == '/':
        num1 = input("Enter a number...")
        num2 = input("Enter the second number...")
        if num2 == 0:
            print("Can't divide by zero.")
        else:
            print("The result is {}".format(num1/num2))

while True:
    print("Options")
    print("Write 'Quit' if you want to exit")
    print("Write '+'if you want to make an addition")
    print("Write '-' if you want to make a sottration")
    print("Write '*' if you want to make a moltiplication")
    print("Write '/' if you wantto make a division")
    user_input = raw_input(":") 
    num1 = input("Enter a number...")
    num2 = input("Enter the second number...")

    if user_input == "+":
        result = str(num1+num2)
    elif user_input == "-":
        result = str(num1-num2)
    elif user_input == "*":
        result = str(num1*num2)
    elif user_input == "/":
        if num2 == 0:
            result = "Can't divide by zero"
        else:
            result = str(num1/num2)

    print("The result is", result)