A variable is used to store information that can change. Variables are useful because they let us reuse values instead of typing the same numbers again and again. For example, we can store:

• the distance the turtle moves
• the angle the turtle turns

from turtle import *
screen = getscreen()
tom = Turtle()

distance = 200
angle = 90

for counter in range(4):
    tom.forward(distance)
    tom.right(angle)

• Makes code easier to change
  You only need to change the value once.
• Makes code easier to read
  Variable names help explain what numbers are used for.
• Reduces mistakes
  You do not need to retype the same number many times.