Python Standard Library: turtle-- turtle drawing.

turtle --- turtle graphics

 (Click to view the official documentation.)

 Brief introduction

Import Turtle    # call the library. Turtle instance of an object, the default name for the turtle. 
turtle.forward (10 )

from turtle Import *   # when you call the method, the object can be written turtle omitted.

 

The reason is called turtle, in fact, an imaginary, arrow drawing area as a pen, using it to draw graphics.

turtle module uses the tkinter basic graphical interface, requiring the support of Tk Python version installed.

-m Tkinter python3   # If you have this module will pop up a small window.

 

and turtle module supports object-oriented processes, interfaces 2 + 2 classes:

1. TurtleScreen class: the graphics window defined as the drawing property.
   • Screen derived subclasses the object to produce a single embodiment.
2. RawTurtle (also called RawPen) class: defines how the drawing.
   • Derived subclasses Turtle (also called Pen): drawing on the object class instance Screen.

TurtleScreen above / Screen, the presence RawTurtle / Turtle all methods corresponding to the function, i.e., as part of the process-oriented interfaces.

Interface provides a process  Screen and  Turtle methods of the class corresponding to the function. The same name and function name corresponding method.

• Screen object is automatically created when a method corresponding to the Screen class function is called.
• Automatically creates an (anonymous) Turtle Turtle class of objects when the corresponding function is called a method.

 

⚠️ official documents in great detail. Also includes a large demo script.

 

example

Example, draw five-pointed star, five.

from turtle import *

def draw(x, y):
    penUp () # pen and paper separately, not moving painting. 
    goto (x, y)
    pendown ()

    setheading(0)
    for i in range(5):
        forward(40)
        right(144)

for x in range(0, 250, 50):   #range(start, stop, step)
    draw(x, 0)