Question

我一直在研究这段代码，当我测试它时，它说有一个语法错误，但它没有突出我在IDLE中的错误。有什么想法吗？

import os
import sys
Start=True
while Start==True:
    Operation=input("Please select from the following operations\n"
                          "Add\n"
                          "Subtract\n"
                          "Note: Please type the option exactly as on\nscreen or you will recieve an error message.")
    if Operation==not(in("Add","Subtract")):
        print("That is not a mathmatical operation.\nPlease try again.")
        time.sleep(2)
        os.sys("cls")
    while Operation==str("Add"):
        print("You have selected Addition!")
        time.sleep(2)
        os.sys("cls")

Answer 1

错：

if Operation==not(in("Add","Subtract")):
    print("That is not a mathmatical operation.\nPlease try again.")
    time.sleep(2)
    os.sys("cls")

应该是：

if Operation not in ("Add","Subtract"):
    print("That is not a mathmatical operation.\nPlease try again.")
    time.sleep(2)
    os.sys("cls")

Answer 2

错误在于：

if Operation==not(in("Add","Subtract")):

正确的代码应该是：

if Operation not in("Add","Subtract"):

您还应在代码的开头添加import time，以使time.sleep正常工作。

Python-Invalid语法不会导致错误

2 个答案: