Python Concepts Using Turtle

“Turtle” is a way to draw with Python. Turtle was introduced in 1967 via a language called “Logo”.

turtle is mainly used to introduce coding to the kids. It’s a straightforward yet versatile way to understand the concepts of Python

Getting started with turtle:

Python Version: Ensure that you have version 3 of Python on your computer. If not, then you can download it from the Python website. We use application IDLE to program with turtle.

1. First step is to import turtle Library

import turtle

2. Initialize a variable t which is used to refer the turtle

t = turtle.Turtle()

3. Moving the turtle: There are four functions tells the turtle to move

I Forward: Tells the turtle to move forward by the given distance.

II Backward :Tells the turtle to move backward by the given distance.

III Left: Tells the turtle to

IV Right

t.right(90)
t.forward(100)
t.left(90)
t.backward(100)

Drawing a square:

import turtle
t=turtle.Turtle()
t.forward(90)
t.right(90)
t.forward(90)
t.right(90)
t.forward(90)
t.right(90)
t.forward(90)

Output:

Now lets write the program to draw same square using loop

A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).

import turtle
t=turtle.Turtle()
for i in range(4):
    t.forward(90)
    t.right(90)

OR

import turtle
t=turtle.Turtle()
for i in [1,2,3,4]:
    t.forward(90)
    t.right(90)

OR

import turtle
t=turtle.Turtle()
a=[1,2,3,4]
for i in a:
    t.forward(90)
    t.right(90)

Output:

Now lets using the function pen color and pen size to change the color and size of pen respectively for the same square.

import turtle
t=turtle.Turtle()
a=["red","green","orange","blue"]
for i in a:
    t.pencolor(i)
    t.forward(90)
    t.right(90)

Output:

Tuple: A tuple is a collection which is ordered and unchangeable. Since tuple is immutable

import turtle
t=turtle.Turtle()
t.pensize(5)
a=("red","green","orange","blue")
for i in a:
    t.pencolor(i)
    t.forward(90)
    t.right(90)

Output:

Dictionary

Dictionaries are used to store data values in key:value pairs.

A dictionary is a collection which is ordered*, changeable and does not allow duplicates.

#syntax
a={1:"red",
   2:"green",
   3:"blue",
   4:"orange"}

Example: Turtle with dictionary

import turtle
t=turtle.Turtle()
t.pensize(5)
a={1:"red",2:"green",3:"blue",4:"orange"}
for i in a:
    t.pencolor(a[i])
    t.forward(90)
    t.right(90)

Output: