Loop

Sometimes we repeat the same lines of codes when we make the turtle draw a shape, such as a square.

To avoid repeating codes, we can use a loop.

A "for loop" works best because we specify how many times a block of code has to repeat.

When we draw a square, we do the same thing four times — move the turtle forward some distance and turn 90 degrees.
We previously used 8 lines of Python code to have alex the turtle draw the four sides of a square.
This next program does exactly the same thing (draw a square) but, with the help of the for loop, uses just three lines (not including the setup code).
Remember that the for loop will repeat the forward and left four times, one time for each value in the list.

Multiple Turtles and Loops