Python - Case Study: Interface Design(the turtle Module, drawing approximate circle by calling polygon)

Think Python

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Think Python (Allen B. Downey (著)、 O'Reilly Media)のChapter 4.(Case Study: Interface Design)のExercises 4-4(No. 867)を取り組んでみる。

Exercises 4-4(No. 867)

コード(Emacs)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import turtle
import math

def polygon(t, length, n):
    angle = 360 / n
    for _ in range(n):
        t.fd(length)
        t.lt(angle)

def circle(t, r):
    N = 100
    circumference = 2 * math.pi * r
    length = circumference / N
    polygon(t, length, N)
    
if __name__ == '__main__':
    bob = turtle.Turtle()
    circle(bob, 100)
    turtle.mainloop()    

入出力結果(Terminal, IPython)

$ ./sample4.py
$