上游充通大 ParisTech SHANGHAI JIAO TONG UNIVERSITY INSTITUT DES SCIENCES ET TECHNOLOGIES PARIS INSTITUTE OF TECHNOLOGY Functions,Informally There's some duplicated code in the program! (print "Happy birthday to you!" We can define a function to print out this line: def happy(): print"Happy birthday to you!" With this function,we can rewrite our program. 99 Functions, Informally • There’s some duplicated code in the program! (print "Happy birthday to you!") • We can define a function to print out this line: def happy(): print"Happy birthday to you!" • With this function, we can rewrite our program