我的雪有多干净？

#1 楼

from random import randrange
import time

# Snow animation
# Snow is simply the `#` symbol here. Half of the snow moves at 1 char
# per frame, while the other half moves at 0.5 chars per frame. The
# program ends when all the snow reaches the bottom of the screen.
# The viewing area is 80x25. It puts 100 snow flakes to output, half
# fast, and half slow. Every frame it dispenses 4 flakes, 2 fast and
# 2 slow ones, at random locations at the top of the viewing area.

screen = {'x': 80, 'y': 20}
drops = []

def createRainDrop(x, y, speed):
    return {'x': x, 'y': y, 'speed': speed}

class RainDrop(object):
    def __init__(self, x, y, speed):
        self.x = x
        self.y = y
        self.speed = speed

def createRandomDrops():
    dropCount = 4
    for i in range(dropCount):
        yield RainDrop(randrange(0, screen['x']), 0, min((i % 2) + 0.5, 1))

def moveDrops():
    for drop in drops:
        drop.y = drop.y + drop.speed

def drawDrops():
    out = [''] * screen['y']
    for y in range(screen['y']):
      for x in range(screen['x']):
        out[y] += '#' if any([drop.x == x and drop.y == y for drop in drops]) else ' '

    return '\n'.join(out)

#2 楼

#3 楼

  for flake in flurry:

#4 楼

# -*- coding: utf8 -*-

#5 楼

def createRandomDrops():
    dropCount = 4
    for i in range(dropCount):

def drawDrops():

#6 楼

from random import randrange

import random