Develop a well-structured function to determine the elapsed days in a year. The function should be passed three values: mo = the month (112), da = the day (131), and leap = (0 for nonleap year and 1 for leap year). Test it for January 1, 1999; February 29, 2000; March 1, 2001; June 21, 2002; and December 31, 2004. Hint: A nice way to do this combines the for and the switch structures.

Note(by using python)