Python loop invalid input

Reject invalid input using a loop in python

take input
while incorrect input:
    take input
    
#Eg. Taking the month input for the first quarter of the year.
months = ['january', 'february', 'march']
month = input('Select the month').lower()
while month not in months:
  month = input('Oops! Incorrect input. Select month again').lower()

Python loop invalid input

while True:
    try:
        # Note: Python 2.x users should use raw_input, the equivalent of 3.x's input
        age = int(input("Please enter your age: "))
    except ValueError:
        print("Sorry, I didn't understand that.")
        #better try again... Return to the start of the loop
        continue
    else:
        #age was successfully parsed!
        #we're ready to exit the loop.
        break
if age >= 18: 
    print("You are able to vote in the United States!")
else:
    print("You are not able to vote in the United States.")

Source: stackoverflow.com

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