# functions go here...
def make_statement(statement, decoration, lines):
    """Creates headings (3 lines), subheadings (2 lines) and
    emphasised text / mini-headings (1 line).  Only use emoji for
    single line statements"""

    middle = f"{decoration * 3} {statement} {decoration * 3}"
    top_bottom = decoration * len(middle)

    if lines == 1:
        print(middle)
    elif lines == 2:
        print(middle)
        print(top_bottom)

    else:
        print(top_bottom)
        print(middle)
        print(top_bottom)
def yes_no(question):

    """Checks that users enter yes / y or no / n to a question"""

    while True:
        response = input(question).lower()

        if response == "yes" or response == "y":
            return "yes"
        elif response == "no" or response == "n":
            return "no"
        else:
            print("Please enter yes (y) or no (n).\n")


# Main routine goes here
want_instructions = yes_no("Do you want to read the instructions? ")
if want_instructions == "yes" or want_instructions == "y":
    make_statement("Instructions", "=", 3)
    print()
    make_statement("Pick either area or perimeter, then choose your shape and input the sizes of the sides!", "-", 2)
    print()
    make_statement("The calculator will find the area or perimeter as well as showing you what equation it used", "!",
                   1)
elif want_instructions == "no" or want_instructions == "n":
    print("you chose no")
else:
    print("please enter yes or no")