when you run ninetyninebottles pythe output will look like thisninety-nniine boottelsby al sweigart al@inventwithpython com --snip- bottles of milk on the wall bottles of milktake one downpass it around bottles of milk on the wall bottles of milk on the wall bottles of milktake one wnpass it around bottles of milk on the wall bottles of milk on the wall bottels of milktake one wnpass it around bottles of milk on the wall--snip- otlte of mil on teh wall ottels milktake one wnpass it ar und bbottles of milk on wall--snip- otle of iml oo nteh lall tle ff fmmliikktaake on wnpaasss itt au nn dno more bottles of milk on the wallhow it works string values in python are immutablemeaning they cannot be changed if the string 'hellois stored in variable called greetingthe code greeting greeting world!doesn' actually change the 'hellostring ratherit creates new string'hello world!'to replace the 'hellostring in reeting the technical reasons for this are beyond the scope of this bookbut it' important to understand the distinctionbecause it means code like reeting[ 'hisn' allowedsince strings are immutable howeversince lists are mutablewe can create list of single-character strings (as line does)change the characters in the listand then create string from the list (line this is how our program seemingly changesor mutatesthe strings containing the song lyrics """ninety-nniine boottels of mlik on teh wall by al sweigart al@inventwithpython com print the full lyrics to one of the longest songs everthe song gets sillier and sillier with each verse press ctrl- to stop view this code at tagsshortscrollingword"" project #