作业3月30号

1、检索文件夹大小的程序，要求执行方式如下
python3.8 run.py 文件夹

import os
import sys


def get_size(dir):
    items = os.listdir(dir)
    for item in items:
        item = os.path.join(dir, item)
        if os.path.isdir(item):
            get_size(item)

        file_size = os.path.getsize(item)
        items_size.append(file_size)


if not sys.argv:
    print('文件夹不存在')
    sys.exit()

items_size = []
get_size(sys.argv[1])
print(sum(items_size))

2、随机验证码

def func(n=4):
    res=''
    for line in range(n):
        s1=chr(random.randint(65,90))
        s2=chr(random.randint(97,122))
        s3=str(random.randint(0,9))
        res+=random.choice([s1,s2,s3])
    return res
print(func())

3、模拟下载以及打印进度条

import time


def progress(percent):
    if percent > 1:
        percent = 1
    res = int(50 * percent) * '#'
    print('
[%-50s] %d%%' % (res, int(100 * percent)), end='')

recv_size=0
total_size=1025011

while recv_size < total_size:
    time.sleep(0.01) 
    recv_size+=1024 

    percent = recv_size / total_size  # 1024 / 333333
    progress(percent)

4、文件copy脚本

import sys

src_file=sys.argv[1]
dst_file=sys.argv[2]

with open(r'%s' %src_file,mode='rb') as read_f,
    open(r'%s' %dst_file,mode='wb') as write_f:
    for line in read_f:
        write_f.write(line)

print('拷贝完成')