圣誕節就要到了，是不是有一種想要畫一顆漂亮的圣誕樹的沖動呢？Python 可以輕松實現這個愿望！接下來，我們就來一起學習如何用 Python 畫出一顆漂亮的圣誕樹。

import turtle
# 畫圓
def circle(size):
turtle.speed(100)
turtle.pencolor("#E60000")
turtle.fillcolor("#E60000")
turtle.begin_fill()
turtle.circle(size)
turtle.end_fill()
# 畫星星
def star(size):
turtle.speed(100)
turtle.pencolor("gold")
turtle.fillcolor("gold")
turtle.begin_fill()
for i in range(5):
turtle.forward(size)
turtle.right(144)
turtle.forward(size)
turtle.left(72)
turtle.end_fill()
# 畫圣誕樹
def christmas_tree(height):
turtle.speed(100)
# 畫樹干
turtle.pencolor("brown")
turtle.fillcolor("brown")
turtle.penup()
turtle.setposition(0, 0)
turtle.pendown()
turtle.begin_fill()
turtle.goto(20, 0)
turtle.goto(20, -height)
turtle.goto(-20, -height)
turtle.goto(-20, 0)
turtle.end_fill()
# 畫樹葉
turtle.pencolor("green")
turtle.fillcolor("green")
turtle.penup()
turtle.goto(-100, -height)
turtle.pendown()
turtle.begin_fill()
turtle.goto(0, height/2)
turtle.goto(100, -height)
turtle.goto(0, -height/2)
turtle.goto(-100, -height)
turtle.end_fill()
# 畫圓
turtle.penup()
turtle.goto(0, height/2)
turtle.pendown()
circle(height/10)
turtle.penup()
turtle.goto(10, height/2)
turtle.pendown()
circle(height/10)
turtle.penup()
turtle.goto(-10, height/2)
turtle.pendown()
circle(height/10)
# 畫星星
turtle.penup()
turtle.goto(0, height/2+height/10*0.8)
turtle.pendown()
star(height/10)
# 主函數
if __name__ == "__main__":
turtle.setup(500, 500)
turtle.penup()
turtle.goto(0, -200)
turtle.pendown()
christmas_tree(200)
turtle.exitonclick()

上述代碼中，我們定義了三個函數，分別用于畫圓、畫星星和畫圣誕樹。在主函數中，我們通過 turtle 庫，控制海龜來畫出一顆漂亮的圣誕樹。

如果你想要更加個性化的圣誕樹，不妨修改代碼中的顏色、尺寸等參數。希望大家在這個圣誕節里，畫出屬于自己的漂亮圣誕樹！