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

# modules do not have codes to execute
# there are just functions that we define
# when you try to run it, there will be no output

# don't write input() inside functions!!!! We pass information into functions from a program
# functions do not get information from the input() function

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

def voting_age():
    # this function does not need parameters because we are not calculating anything
    # it just returns the number 18

    # indent for the body of the function
    result = 18

    # return is a keyword --> indicates what value to return from the function
    # once return is executed, the function finishes
    return result    # result = 18 so return 18

    # any code below return will not be executed

# 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 ):
    '''
        Function takes in one parameter, s, where s is a string.
        returns True or False depending on whether s has at least one blank or not
    '''
    if ( ' ' in s ):
        # if there is a blank in the string s
        result = True
    else: # otherwise, there is no space character in string s
        result = False

    # result takes on True or False depending on which condition is True
    return result

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

def great_seal():
    '''
        Takes in no parameters. Only prints the string 'E Pluribus Unum'
        Does not return anything! --> will hand back keyword None
    '''
    print( '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.

def a_ing( n ):
    '''
        Takes in 1 parameter, n, where n is an int
        Prints 1->n 'a' per line n times
        no return statement, so will return None
    '''
    output_line = ''
    for i in range(0, n):
        # for each i, add one more 'a' to the string output_line
        output_line = output_line + 'a'
        print( output_line )