Exceptions in Python are managed with try-except blocks (exception_name):

def one_function():
     try:
         # Division by zero causes one exception
         10/0
     except ZeroDivisionError:
         print("Oops, error.")
     else:
         # There was no exception, we can continue.
         pass
     finally:
         # This code is executed when the block
         # try..except is already executed and all exceptions
         # have been managed, even if a new one occurs
         # exception directly in the block.
         print("We finished.")

>>> one_function()
Oops, error.
We finished