Raspberry Pi: Tips and Tricks to Learn Raspberry Pi Programming by Pratt Logan

Author:Pratt, Logan [Pratt, Logan]
Language: eng
Format: epub
Published: 2020-08-04T00:00:00+00:00

Self-Project: Turtle Snowflakes

By now, you learned how Python works. Now the time is right to learn about graphics and create some snowflakes. In essence, physical robots have shapes similar to their animal namesakes. For example, turtles are constructed to only move in a straight line, either lift or lower a pen. When we convert it to a digital version, it means to start or end, drawing a specific line with its movement.

Opposite to other languages, e.g., Logo along with its variants, Python doesn’t have this turtle tool. However, it has numerous add-on codes to provide it a turtle power. These codes libraries have numerous codes that include new information and instructions to increase the capabilities of Python. These codes libraries are provided into your programs through an import command. Form a new program through pressing on the New icon, and writing the following:

import turtle

For using the instructions given in the library, use the library name, and then add a full stop and complete it with the instruction name. It feels hard to type your user name repeatedly, therefore, choose a smaller variable name. It can be as short as one letter, or you can use twice the pet name. Therefore, type the following:

var = turtle.Turtle()

To check the program if it is working or not, give the turtle a task to do. So type:

pat.forward(50)

Now press icon saying Run and save the program with the name Turtle Snowflakes. As soon as the program is saved, one new window with the name of Turtle Graphics will appear. This window will show the results of your program as your turtle, Pat, will go forward for 50 units forming one straight line.

After this step, go back to the main Thonny window. Possibly, it will be hidden on the backside of the Turtle Graphic window, so click the minimize option visible on the Turtle Graphics window. Another option to switch back to Thonny’s main window is to press the Thonny entry present in the taskbar on the upper side of the screen. After this, press the Stop button in order to terminate the Turtle Graphic window.

Writing each and every movement instruction is a difficult task to do; therefore, delete line three and form a loop to perform a difficult task of creating shapes:

for i in range(1):

pat.forward(50)

pat.right(30)

pat.forward(50)

pat.right(60)

Now run the program, var will draw one parallelogram.

To convert it into a shape similar to the snowflake, press the Stop icon Thonny’s main window and form a loop which circles your loop through adding the below-given line for line 3:

for i in range(5):

And the below-given line at the lower side of your program:

pat.right(18)

It is hard for your program to run it because the existing loop is not rightly indented. For fixing it, press at the beginning of each line of the current Start of Loop from line 4 till line 8 and push the SPACE key for up to 4 times to make indentation correct. After this step, your program will look like the following:

import turtle

var = turtle.Turtle()

for i in range(5):

for i in range(1):

pat.

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