Loops

Introduction

One more thing: Our programs often featured repetition. There is a powerful concept in Python called looping, which we will elaborate later on. For now, take this easy example:

for i in range(10):
    print("Hello!")

Drawing a dashed line

Exercise

Draw a dashed line. You can move the turtle without tracing a line behind you with the turtle.penup() function; put it back on the ground with turtle.pendown().

Solution

for i in range(10):
    turtle.forward(15)
    turtle.penup()
    turtle.forward(5)
    turtle.pendown()

Bonus

Can you make the dashes become larger as the line progresses?

Honeycomb loops

Exercise

Take your honeycomb program and make it easier with loops. How small can you get it?

Solution

def hexagon():
    for i in range(6):
        turtle.forward(100)
        turtle.left(60)

for i in range(6):
    hexagon()
    turtle.forward(100)
    turtle.right(60)