Python exception handling

• use keywords try and except to handle an exception
• example:

  a = input('type an number:')
  b = input('type another:')
  a = int(a)
  b = int(b)
  
  # what if user enters b = 0?
  # this is not allowed and will throw an exception
  
  try:
    print(a / b)
  except ZeroDivisionError:
    print('b cannot be zero.')