''' Purpose: develop programmer-defined functions
'''

# function voting_age(): returns how old you need to be to vote; i.e. the
#     integer 18.
    # the function should not print() anything, it should return 18
    # you will never need to use input() in a function in this class
def voting_age() : # this function does not have any parameters, so the parentheses are empty
    result = 18
    return result # we are returning something called result, so we need to figure out what result is
    # any code in this function after the return statement will not be run
    # as soon as we reach a return statement, we exit the function and go back to the code that invoked it

# 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.
def has_blanks( s ) : # this function takes 1 string parameter, s
    # this function needs to return True or False every
    if ( " " in s ) :
        result = True
    else :
        result = False
    return result

# function great_seal( ): prints the string 'E Pluribus Unum'
def great_seal() : # no information needed, so no parameter
    # no result, so no return statement
    print( 'E Pluribus Unum' )
    return # tell Python we're all done, and it will automatically return None
    # return statement is optional in functions that do not hand anything back to the user

# 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.
def a_ing( n ) : # this takes a single integer parameter, n
    # this does not return anything, it just prints
    # this function is going to assume that n is an integer, we do not need to cast it or clean it up in any way
    for i in range( 0, n ) : # i is a commonly used loop variable for counting
        # could also loop through the range( 1, n + 1 ) and output = 'a' * i
        # print i + 1 'a's per line
        output = 'a' * ( i + 1 )
        print( output )