前言

本文章向大家介绍用 Python 实现雪花飘落效果，运行以下代码，你将会看到一个美丽的雪花效果。你可以根据自己的需求，调整代码中的参数值以及其他细节。

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第一种

普通雪花代码：

import turtle
import random

def draw_snowflake(length, depth):
    if depth == 0:
        turtle.forward(length)
        return
    length /= 3.0
    draw_snowflake(length, depth-1)
    turtle.left(60)
    draw_snowflake(length, depth-1)
    turtle.right(120)
    draw_snowflake(length, depth-1)
    turtle.left(60)
    draw_snowflake(length, depth-1)

turtle.speed(0)
turtle.penup()
turtle.goto(-200, 200)
turtle.pendown()

for i in range(3):
    draw_snowflake(400, 4)
    turtle.right(120)

turtle.hideturtle()
turtle.done()

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第二种

随机下落的雪花：

import pygame, random

# 初始化 Pygame
pygame.init()

# 创建屏幕
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Python 雪景")

# 定义颜色
WHITE = (255, 255, 255)

# 创建雪花列表
snow_list = []
for i in range(300):
    x = random.randrange(0, 800)
    y = random.randrange(0, 600)
    snow_list.append([x, y])

# 创建时钟对象
clock = pygame.time.Clock()

# 循环标志
done = False

# 游戏循环
while not done:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True

    # 填充屏幕为白色
    screen.fill(WHITE)

    # 循环雪花列表
    for i in range(len(snow_list)):
        # 绘制雪花
        pygame.draw.circle(screen, WHITE, snow_list[i], 2)

        # 移动雪花
        snow_list[i][1] += 1

        # 雪花超出屏幕，重置位置
        if snow_list[i][1] > 600:
            y = random.randrange(-50, -10)
            snow_list[i][1] = y
            x = random.randrange(0, 800)
            snow_list[i][0] = x

    # 更新屏幕
    pygame.display.flip()

    # 控制帧率
    clock.tick(60)

# 退出 Pygame
pygame.quit()

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第三种

随机颜色代码：

import turtle
import random

colors = ["blue", "purple", "cyan", "white", "yellow", "orange"]

turtle.speed(0)
turtle.bgcolor("black")

for i in range(10):
    color = random.choice(colors)
    turtle.color(color)
    turtle.pensize(i / 2 + 1)
    turtle.forward(100)
    turtle.right(120)

turtle.done()

使用了turtle模块和random模块，会在黑色背景上生成随机颜色的雪花。你可以根据需要调整colors列表中的颜色，来生成你想要的效果。

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第四种

包含三种大小的Python雪花代码：

import turtle
import random

# Set up the screen
wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Snow")

# Create a variable for the number of snowflakes
num_snowflakes = 100

# Create a list of colors
colors = ["white", "lightgray", "gray"]

# Create a function to draw snowflakes
def draw_snowflake(size):
    # Draw a hexagon
    for i in range(6):
        turtle.forward(size)
        turtle.right(60)
        turtle.forward(size)
        turtle.right(120)
    # Draw a dot in the center
    turtle.dot(size // 2)

# Create a loop to draw the snowflakes
for i in range(num_snowflakes):
    # Move to a random position on the screen
    x = random.randint(-300, 300)
    y = random.randint(-300, 300)
    turtle.penup()
    turtle.goto(x, y)
    turtle.pendown()
    # Draw a snowflake with a random size and color
    size = random.randint(5, 25)
    color = random.choice(colors)
    turtle.color(color)
    draw_snowflake(size)

# Hide the turtle
turtle.hideturtle()

# Keep the screen open until it is closed manually
turtle.done()

使用了turtle模块来绘制雪花。首先设置画布的背景色和标题。接着定义了一个draw_snowflake函数，用于绘制雪花。在主循环中，使用random模块来生成随机位置、大小和颜色的雪花，最后隐藏了画笔，使得只显示雪花。

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第五种

用Python的turtle库来画雪花形状：

import turtle

# 设置画布和画笔
wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Snowflake")

pen = turtle.Turtle()
pen.speed(0)
pen.color("white")

# 画雪花形状
def snowflake(size):
    if size <= 10:
        pen.forward(size)
        return
    else:
        snowflake(size/3)
        pen.left(60)
        snowflake(size/3)
        pen.right(120)
        snowflake(size/3)
        pen.left(60)
        snowflake(size/3)

# 画三个不同大小的雪花
pen.penup()
pen.goto(-200, 0)
pen.pendown()
snowflake(300)

pen.penup()
pen.goto(0, 0)
pen.pendown()
snowflake(200)

pen.penup()
pen.goto(200, 0)
pen.pendown()
snowflake(100)

# 关闭画布
wn.exitonclick()

这个代码将会在黑色背景上绘制白色雪花。使用递归函数来生成雪花的形状，大小为参数“size”。