Welcome to the interactive get drawing with python turtle page. This page should guide you through starting python and drawing using the turtle module. Perform the actions in red. Write the codes shown in green into your code editor and run it.

== First read the information under the form ==

When you are ready Enter your name and press START:

The easiest option when in CS lessons is to use the IDLE editor installed on the college computers

To have python installed on your computer use: python.org downloads
Make sure the website detects your correct operating system before installing

Alternatively:
• Online version at repl.it python turtle
  
• Online version at trinket.
  

First turtle program

Python is a text based programming language

If you are using the IDLE open the editor: select File->New File

If you are using repl choose "Create" and select "Python (with Turtle)"

In the code editor window enter the lines:

from turtle import *
forward(100)

Test it! If you are using the IDLE select Run->Run Module the shortcut key is F5. Save to Onedrive if possible and name your program test1 or similar. If you are using replit just press Run

Othwerwise work out how to save and run the code on the editor you are using

What is the shortcut key to run the program on IDLE? F4 F5 F10
What does the program do? Draw a circle Draw a square Draw a line

Click the next button if you have selected your answers =>

Pen settings

The instruction forward(100) calls the forward() function with 100 as the argument (or parameter):
Before the forward instruction insert the lines:

color("blue")
pensize(8)

Press F5 to test your program
The picture shows code for a thick green line
Can you change the code to get a thin red line?

Select the best options to complete the paragraphs

The string "blue" is the argument sent to the function forward() color() pensize() import

The integer 8 is the argument sent to the function forward() color() pensize() import

Click the next button if you have selected your answers =>

Error messages

The code executes in the shell window or console
If there is a mistake in the code a red error message will often be printed.
Append (add to the end) these three lines:

back(50)
right(90)
down(50)

In this code there is a common error people make. The down() function should not have a argument in the brackets. It does not move the pen downwards on the drawing canvas. down() does the opposite of the up(). The up() fucntion lifts the pen away from the canvas so the pen can move without drawing. The down() function places the pen back onto the canvas to draw.

Three of these statements are correct ...

The error is on the use of the down() function. TrueFalse

The down() function should have 1 argument but was given 0. TrueFalse

If we have turned to face downwards we can use the forward() function to draw a line downwards TrueFalse

The down() function is for putting the pen down to draw after it has been lifted up() TrueFalse

Extended code sequence

Commands can be added to the program and will be performed in order

Try this program:

from turtle import *
color("ForestGreen")
pensize(8)
left(90)
forward(50)
up()
right(90)
forward(80)
right(90)
down()
forward(50)
back(50)
color("DarkOliveGreen")
right(90)
back(10)
forward(100)
hideturtle()

Select the function matching the descriptions

The turtle starts facing to the right so this command makes it turn to go up left(90) forward(100) up() down() .

This command allows the turtle to move without drawing left(90) forward(100) up() down() .

This command makes the turtle draw again next time it moves left(90) forward(100) up() down() .

This command draws the top of the table in "DarkOliveGreen" left(90) forward(100) up() down() .

Iterative code sequence

Commands can be placed inside a repeating for loop to be executed more than once

Create a new file and make the program shown:

The program makes use of repetition.
This is also called iteration as you can program it
so that each repitition does something different.
Change some of the numbers that are sent as arguments
to the functions and run the program to see the effect.

Select the option to make a correct statement

The number of times the for loop iterates is set by the argument of forward() right() back() range() .
The length of the line is set by the argument of forward() right() back() range() .
The angle of the turn is set by the argument of forward() right() back() range() .
How far from the end of one line the next line is drawn is set by the argument of forward() right() back() range() .

Well done you have completed the Python turtle introduction

Have a look at the python art section on the Y8 index page "samples to try" or browse the internet for python turtle examples

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