It will print the collatz sequence given an initial positive integer number

collatz_conjecture.py

def collatz(number):
    if number % 2 == 0:
       print(number // 2)
       return (number // 2)
    else:
       print(3 * number + 1)
       return (3 * number + 1)



while True:
     intero= input('Write a positive integer or write "done" if you want to exit: ')
     if intero == 'done':
         break
     else:
         try:
             intero = int(intero)
             if intero > 0:
                 k = collatz(intero)
                 while True:
                     if k == 1:
                         break
                     else:
                         k = collatz(k)
             else:
                 print('Collatz sequence takes only positive integers')
         except:
          print('Wrong input, write a positive integer')
     print()