python画半圆环

以下是两种Python画半圆环的例子：

1. 使用PIL库绘制半圆环：

from PIL import Image, ImageDraw

# 创建一个空白图像
image = Image.new("RGB", (500, 500), "white")
draw = ImageDraw.Draw(image)

# 绘制半圆环
draw.arc((100, 100, 400, 400), 0, 180, fill="blue", width=10)

# 保存图像
image.save("half_circle.jpg")

2. 使用Turtle库绘制半圆环：

from turtle import *
from random import *
from math import *

# 初始化
screensize(500, 500)
speed(0)
penup()

# 绘制半圆环
def draw_circle(color, radius):
    pendown()
    fillcolor(color)
    begin_fill()
    circle(radius, 180)
    left(90)
    forward(radius * 2)
    left(90)
    circle(radius, 180)
    end_fill()
    penup()

# 绘制多个半圆环
def draw_peacock():
    colors = ["red", "orange", "yellow", "green", "blue", "purple"]
    radius = 100
    for i in range(6):
        draw_circle(colors[i], radius)
        radius += 20

# 调用函数绘制半圆环
draw_peacock()