Python Turtle - For Loop & While Loop

Turtle for loops can provide interesting results, like circles inside circles using dedicated circle() method: 

import turtle

t = turtle.Turtle()
t.speed(0)

for x in range(20, 50):
    t.circle(x * 2)

 

Change of object orientation can be fun experiment:

import turtle

t = turtle.Turtle()
t.speed(0)

for x in range(20, 50):
    t.circle(x * 2)
    t.left(180)
    t.circle(x * 2)
    t.right(90)

 

And we can get same or similar results with while loops. But sometimes that demands a little bit more thinking:

import turtle

t = turtle.Turtle()
t.speed(0)

n = 20

while n < 50:
    t.circle(n * 2)
    t.left(180)
    t.circle(n * 2)
    t.left(90)
    n = n + 1

Definitely check YouTube tutorial on Turtle For and While Loops.