''' 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.

# Olio is a module/library with these function definitions
# voting_age, has_blanks, etc. In use_olio, we import module olio and then
# have the ability to use functions from olio.

def voting_age(): # This function has no parameters! When it's called, it hands back 18
    age = 18
    return age

# 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 ):
    blank = ' '
    if ( blank in s ): # We check if there's a blank (a space) in s
        return True # return True if there is a blank
    else:
        return False

# Please be supperrrr careful when printing inside functions.
    # Usually we tell you exactly what we want and usually DON'T
    # print inside functions. Remember print() is not return.
# function great_seal( ): prints the string 'E Pluribus Unum'

def great_seal(): # This function also takes in no parameters
    # it simply prints the message when it's called.
    # No return statement! Return is NOT PRINT NOT PRINT NOT PRINT.
    # return is a value the function hands back upon invocation (doesn't print
    # unless you say print)
    # Print will print it to the console upon function invocation.

    message = 'E Pluribus Unum'
    print ( message )
# THIS FUNCTION RETURNS NONE by default. All functions without an
# explicit return statement return None by default. (IMPORTANT)
# All functions have a return value! (None or whatever you explicitly said to return)

# 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.

...