1. Using the Python Turtle
GCSE COMPUTER SCIENCE
Using the Python Turtle
Practical Programming using Python
Lesson 16 – Using the Python Turtle

2. You are going to use the Python Turtle
Introduction
You are going to use the Python Turtle
The Turtle is an arrow you control on the screen
It allows you to draw shapes and patterns using Python commands

3. Turtle Commands Main Turtle Commands forward()
Moves the turtle forward a set number of pixels
t.forward(50)
right()
Rotates the turtle clockwise a set number of degrees
t.right(90)
left()
Rotates the turtle anti-clockwise a set number of degrees
t.left(90)
ACTIVITY
Create a new folder in your C2 folder called Turtle. Save all your Turtle work in this folder.

4. Example How to screenshot
Create a program to draw a straight line of length 100
Code screenshot
Shape screenshot
Do not save the program as turtle.py – see the next slide
How to screenshot
Use the Windows Snipping Tool: Start / All Programs / Accessories / Snipping Tool

5. Create a program to draw a straight line of length 100
Activity 1
Create a program to draw a straight line of length 100
Code Screenshot
Shape Screenshot
Save the program as turtle1.

6. Create a program to draw a Square with each line being 100 in length
Activity 2
Create a program to draw a Square with each line being 100 in length
Code Screenshot
Shape Screenshot
Save the program as turtle2.

7. Save the program as turtle3.
Activity 3
Create a program to draw a Rectangle with each long line being 100 in length and the short lines being 50 in length
Code Screenshot
Shape Screenshot
Save the program as turtle3.

8. Changes the colour of the pen
Pen Colour
pencolor()
Changes the colour of the pen
t.pencolor(”red”)
Colours include: Red, blue, green, yellow, purple, orange, pink , brown and grey.

9. Save the program as turtle4.
Activity 4
Create a program to draw a red Rectangle with the long lines being 150 and short lines being 100 in length
Code Screenshot
Shape Screenshot
Save the program as turtle4.

10. This is the angle you need to use
Shape Angles
Shape Name
Number of Sides
Sum of Interior Angles
Interior Angle
Exterior Angle
Triangle 3
180 60
360
No. of Sides
Square 4 90
Pentagon 5
540
108
Hexagon 6
720
120
Heptagon 7
900
128.6
Octagon 8
1080
135
Nonagon 9
1260
140
Decagon 10
1440
144
This is the angle you need to use

11. Save the program as turtle5.
Activity 5
Create a program to draw a green equilateral Triangle with each line being 80 in length
Code Screenshot
Shape Screenshot
Save the program as turtle5.

12. Save the program as turtle6.
Activity 6
Create a program to draw a red Pentagon with each line being 120 in length
Code Screenshot
Shape Screenshot
Save the program as turtle6.

13. Save the program as turtle7.
Activity 7
Create a program to draw a blue Hexagon with each line being 90 in length
Code Screenshot
Shape Screenshot
Save the program as turtle7.

14. Changes the size of the pen.
Pen Size
pensize()
Changes the size of the pen.
t.pensize(10)

15. Save the program as turtle8.
Activity 8
Create a program to draw a yellow Rhombus with each line being 75 in length Tip: You will need to change the angle before going forward!
Code Screenshot
Shape Screenshot
Save the program as turtle8.

16. Save the program as turtle9.
Activity 9
Create a program to draw a red parallelogram with each long line being 100 and short line being 50 in length and with a pen thickness of 10
Tip: Each small and large angle needs to add up to 180, and each opposite angle is the same
Code Screenshot
Shape Screenshot
Save the program as turtle9.

17. Circles circle() Allows you to draw a circle t.circle(10)
The number represents the radius of the circle.

18. Save the program as turtle10.
Activity 10
Create a program to draw a pink circle with a radius of 50 with a pen thickness of 5
Code Screenshot
Shape Screenshot
Save the program as turtle10.

19. Loops save you time, below is the code to create a square
For Loops
Loops save you time, below is the code to create a square
import turtle as t
for i in range(4): #this is how many sides the shape has
t.forward(50) #this is the length of each side
t.right(90) #this is the angle the turtle turns

20. Create a program to draw a red square using a loop
Activity 11
Create a program to draw a red square using a loop
Code Screenshot
Shape Screenshot
Save the program as turtle11.

21. Create a program to draw a blue equilateral triangle using a loop
Activity 12
Create a program to draw a blue equilateral triangle using a loop
Code Screenshot
Shape Screenshot
Save the program as turtle12.

22. Changes the colour the canvas
Background Colour
bgcolor()
Changes the colour the canvas
t.bgcolor(”red”)
Colours include: Red, blue, green, yellow, purple, orange, pink , brown and grey.

23. Save the program as turtle13.
Activity 13
Create a program to draw a green Pentagon using a loop with a background colour of yellow
Code Screenshot
Shape Screenshot
Save the program as turtle13.

24. Save the program as turtle14.
Activity 14
Create a program to draw a yellow Hexagon using a loop with a background colour of black
Code Screenshot
Shape Screenshot
Save the program as turtle14.

25. Save the program as turtle15.
Activity 15
Create a program to draw a purple Heptagon using a loop with a background colour of pink
Code Screenshot
Shape Screenshot
Save the program as turtle15.

26. Save the program as turtle16.
Activity 16
Create a program to draw an orange Octagon using a loop with a background colour of grey
Code Screenshot
Shape Screenshot
Save the program as turtle16.

27. Allows you to colour fill a shape
import turtle as t
t.fillcolour(“red”)
t.begin_fill()
<<< normal shape code goes here >>>
t.end_fill()

28. Save the program as turtle17.
Activity 17
Create a program to draw a filled pink Nonagon using a loop with a background colour of green
Code Screenshot
Shape Screenshot
Save the program as turtle17.

29. Save the program as turtle18.
Activity 18
Create a program to draw a filled blue Decagon using a loop with a background colour of yellow
Code Screenshot
Shape Screenshot
Save the program as turtle18.

30. This code creates a Star
Stars
This code creates a Star
import turtle as t
for i in range(50):
t.forward(50)
t.right(144)

31. Save the program as turtle19.
Activity 19
Create a program to draw a star that uses a size, pen colour, fill colour and background colour of your choice
Code Screenshot
Shape Screenshot
Save the program as turtle19.

32. This code creates a spiralling Star
Stars
This code creates a spiralling Star
import turtle as t
for i in range(50):
t.forward(i * 5)
t.right(144)

33. Save the program as turtle20.
Activity 20
Create a program to draw a spiralling star that uses a pen colour and background colour of your choice
Code Screenshot
Shape Screenshot
Save the program as turtle20.

34. These commands will help you with the next activities
More Commands
These commands will help you with the next activities
home()
Moves the turtle back to the starting point
t.home()
penup()
Lifts the pen so it does not write when moved
t.penup()
pendown()
Puts the pen down again
t.pendown()

35. Write your initials using the Turtle shape
Activity 21
CHALLENGE 1
Write your initials using the Turtle shape
You will need to make use of t.penup(), t.pendown() and t.home() AL
Code Screenshot
Shape Screenshot
Save the program as turtle21.

36. Changes the shape of the pen
Pen Shape
shape()
Changes the shape of the pen
t.shape(“turtle”)
Choose from: Arrow, turtle, circle, square, triangle, classic.

37. Write a word of your choice
Activity 22
CHALLENGE 2
Write a word of your choice
Hello
Code Screenshot
Shape Screenshot
Save the program as turtle22.

38. Save the program as turtle23.
Activity 23
CHALLENGE 3
Draw an image of your choice using the techniques you have learnt today
Code Screenshot
Shape Screenshot
Save the program as turtle23.