1. import turtle
    3. import turtle as t
    4. import random
    5. import time
    6. # 代码修改自https://blog.csdn.net/Ding2langdang
    7. def drawlight():
    8.    """
    9.   画彩灯
    10.   """
    11.    if random.randint(0, 30) == 0:
    12.        t.color('tomato')
    13.        t.circle(6)
    14.    elif random.randint(0,30) == 1:
    15.        t.color('orange')
    16.        t.circle(3)
    17.    else:
    18.        t.color('dark green')
    21. def tree(d, s):
    22.    '''
    23.   画树
    24.   '''
    25.    if d <= 0:
    26.        return
    27.    t.forward(s)
    28.    tree(d-1, s*.8)
    29.    t.right(120)
    30.    tree(d-3, s*.5)
    31.    drawlight()
    32.    t.right(120)
    33.    tree(d-3, s*.5)
    34.    t.right(120)
    35.    t.backward(s)
    38. def drawsnow():
    39.    '''
    40.   画雪花
    41.   '''
    42.    t.ht()
    43.    t.pensize(2)
    44.    for i in range(200):
    45.        t.pencolor("white")
    46.        t.pu()
    47.        t.setx(random.randint(-350,350))
    48.        t.sety(random.randint(-100,350))
    49.        t.pd()
    50.        dens = 6
    51.        snowsize = random.randint(1,10)
    52.        for j in range(dens):
    53.            t.fd(int(snowsize))
    54.            t.backward(int(snowsize))
    55.            t.right(int(360/dens))
    57. n = 100.0
    59. t.speed("fastest")
    60. t.delay(0)
    61. t.screensize(bg='black')
    62. t.left(90)
    63. t.forward(3*n)
    64. t.color("orange", "yellow")
    65. t.begin_fill()
    66. t.left(126)
    67. for i in range(5):
    68.    t.forward(n/5)
    69.    t.right(144)
    70.    t.forward(n/5)
    71.    t.left(72)
    72. t.end_fill()
    73. t.right(126)
    75. t.color("dark green")
    76. t.backward(n*4.8)
    78. tree(15, n)
    79. t.backward(n/2)
    81. for i in range(200):
    82.    a = 200 - 400 * random.random()
    83.    b = 10 - 20 * random.random()
    84.    t.up()
    85.    t.forward(b)
    86.    t.left(90)
    87.    t.forward(a)
    88.    t.down()
    89.    if random.randint(0, 1) == 0:
    90.        t.color('tomato')
    91.    else:
    92.        t.color('wheat')
    93.    t.circle(2)
    94.    t.up()
    95.    t.backward(a)
    96.    t.right(90)
    97.    t.backward(b)
    99. t.color("dark red","red")
    100. t.write("Merry Christmas!!!",align ="center",font=("Comic Sans MS",40,"bold"))
    102. drawsnow()
    103. t.done()