虽然循环没有返回它的条件

Question

attempts=0

number=int(input("Enter a number from a range of 0 to a 100: "))

while number<0 and number>100:
    attempts=attempts+1
    number=int(input("Number is invalid. Please enter a number from a range of 0 to a 100: "))

attempts=attempts+1    
print("Number of attempts for inputting a valid number: ", attempts)

I'm writing a program where an inputted number is validated from the range 0 to 100. If it's invalid, the number will be rejected and a prompt will be shown to re-input a number. I then need to output the number of attempts it took to input a valid number.

So far, when an integer greater than 0 and less than 100 is inputted, the program works fine. If an integer, let's say -50 is inputted, the prompt should be shown and it then needs to re-input the number - but my while loop isn't returning its condition and it goes to show an output of:

Enter a number from a range of 0 to a 100: -50 
Number of attempts for inputting a valid number:  1

Answer 1

I think in while loop, the condition should be or not and .

attempts=0

number=int(input("Enter a number from a range of 0 to a 100: "))

while number<0 or number>100:
    attempts=attempts+1
    number=int(input("Number is invalid. Please enter a number from a range of 0 to a 100: "))

attempts=attempts+1    
print("Number of attempts for inputting a valid number: ", attempts)

Answer 2

You should use "or" instand of "and":

attempts=0

number=int(input("Enter a number from a range of 0 to a 100: "))

while number<0 or number>100:
    attempts=attempts+1
    number=int(input("Number is invalid. Please enter a number from a range of 0 to a 100: "))

attempts=attempts+1
print("Number of attempts for inputting a valid number: ", attempts)

Answer 3

This is my suggestion:

attempts=0

number=int(input("Enter a number from a range of 0 to a 100: "))

while number not in range(0, 101):
    attempts=attempts+1
    number=int(input("Number is invalid. Please enter a number from a range of 0 to a 100: "))

attempts=attempts+1    
print("Number of attempts for inputting a valid number: ", attempts)

Result:

Enter a number from a range of 0 to a 100: -1
Number is invalid. Please enter a number from a range of 0 to a 100: 101
Number is invalid. Please enter a number from a range of 0 to a 100: 100
Number of attempts for inputting a valid number:  3
Enter a number from a range of 0 to a 100: 0
Number of attempts for inputting a valid number:  1

Answer 4

The mistake is here while number<0 and number>100: or means at least one condition is correct but and means all the conditions are correct. Now look at the condition No number can fulfill your condition like less than 0 and greater than 100 at a sametime. so you can use or operation so one of the conditions are meet the requirements then code execute.

attempts=0
invalid_attempts=0
number=int(input("Enter a number from a range of 0 to a 100: "))
while number<0 or number>100:
    
    number=int(input("Number is invalid. Please enter a number from a range of 0 to a 100: "))
    invalid_attempts+=1
attempts=attempts+1    
print("Number of attempts for inputting a valid number: ", attempts)
print("Number of attempts for inputting a Invalid number: ", invalid_attempts)