Titlecasing a string with exceptions

Question

Is there a standard way in Python to titlecase a string (i.e. words start with uppercase characters, all remaining cased characters have lowercase) but leaving articles like

Answer 1

 not_these = ['a','the', 'of']
thestring = 'the secret of a disappointed programmer'
print ' '.join(word
               if word in not_these
               else word.title()
               for word in thestring.capitalize().split(' '))
"""Output:
The Secret of a Disappointed Programmer
"""

The title starts with capitalized word and that does not match the article.