>>> from words import initials

>>> round(initials('This land is your land, this land is my land...', 'l'), 2)
40.0
>>> round(initials('This land is your land, this land is my land...', 't'), 2)
20.0
>>> round(initials("Hello darkness, my old friend, I come to talk with you again...", 't'), 2)
16.67
>>> round(initials('Hey mister Tambourine man, play a song for me...', 'm'), 2)
33.33