How to re-prompt a user after an invalid input?

Question

Write a function named getBetween.

getBetween should take two arguments: low and high. getBetween should prompt the user for an integer between low and high, inclusive (in other words, greater than or equal to low and less than or equal to high). If the user enters a number that is not in the proper range, getBetween should tell the user that they made an error and ask them again. If the user enters something that is not a number, getBetween should detect this (by using exceptions), inform the user of their error, and ask them again. When the user enters an acceptable answer, return it.

So what I can't figure out how to do is to re-prompt the user if the input number is not in range. Here's my code:

while True:
    try:
      low = int(input("Enter a low number: "))
      high = int(input("Enter a high  number: "))
    except ValueError:
     print("Invalid Input")
     continue
    else:
      break
var = false
def getBetween(low,high):
  while True:
    try:
      number = int(input("Enter a number: "))
    except ValueError:
     print("Invalid Input")
     continue
    else:
      break 
  if low<number<high:
    print(number)
  else:
       print("This input is not in range.")
getBetween(low,high)

Just move the "This input is not in range" block into the While loop above it. That way it won't BREAK out, and you can add the continue. — KuboMD, Jan 10 '19 at 17:37

score 1 · Answer 1 · answered Jan 10 '19 at 17:38

You don't need to "re-prompt". Let the while loop repeat itself.

  while True:
    try:
      number = int(input("Enter a number: "))
      if low<number<high:
        print(number)
        break  # if you want to stop the loop
      else:
        print("This input is not in range.")
        # implicit continue
    except ValueError:
      print("Invalid Input")
      continue  # not really needed

How to re-prompt a user after an invalid input?

1 Answers1