gistfile1.txt

>>> spam = ['first', 'second', 'last']
>>> spam  
['first', 'second', 'last']                                                         
>>> spam.sort()                                                                     
>>> spam                                                                            
['first', 'last', 'second']                                                         
>>> spam.append(1)                                                                  
>>> spam                                                                            
['first', 'last', 'second', 1]                                                      
>>> spam.sort()                                                                     
Traceback (most recent call last):                                                  
  File "<stdin>", line 1, in <module>                                               
TypeError: unorderable types: int() < str()