变量以字符串形式出现； 类型错误：abs() 的错误操作数类型：'str'

Question

When trying to run this code, it seems to insist that variable x is a string, even after double checking that it is an integer and converting it to one.

import time
x = 0

while True:
    print("")
    x = input("Please give a value for X.")
    try:
        int(x)
    except:
        print("")
        print("Sorry, please use an integer and try again!")
        time.sleep(1)
    else:
        int(x)
        break

abs(x)

As mentioned in the title, the error I get in response is this:

TypeError: bad operand type for abs(): 'str'

This also occurs for other basic operands. Why is it detecting the variable as a string and how do I fix it?

Answer 1

X variable wasn't updated when you converted it to int. It should be x = int(x) .

import time
x = 0

while True:
    print("")
    x = input("Please give a value for X.")
    try:
        x = int(x)
    except:
        print("")
        print("Sorry, please use an integer and try again!")
        time.sleep(1)
    else:
        x = int(x)
        break

print(abs(x))

Answer 2

Do:

abs(int(x))

To convert x to integer again

Answer 3

The function int() take an argument and if possible, convert it to an int. it returns the converted argument, but does not modify it. So, you can use it as follow examples:

i=int("123")
i=int(12.5)

s="123"
i=int(s)

line = input("Please give a value for X.")
i=int(line)