''' Name:
    Email id:

    Purpose: develop programmer-defined functions
'''

# function voting_age(): returns how old you need to be to vote; i.e. the
#     integer 18.

...

# function has_blanks( s ): returns a whether s contains at least one blank
#     character; i.e., returns True if s contains a blank, and returns
#     False otherwise.

...

# function great_seal( ): prints the string 'E Pluribus Unum'

...

# function a_ing( n ) prints n lines of output. The first line prints a
#     single 'a', the second line prints 'aa', the third line prints 'aaa',
#     and so on.

...