Python编程快速上手实践项目题目，欢迎指证与优化！
代码：

#! python3
# pw.py - An insecure password locker program.
PASSWORDS = {'email': 'F7minlBDDuvMJuxESSKHFhTxFtjVB6',
'blog': 'VmALvQyKAxiVH5G8v01if1MLZF3sdt',
'luggage': '12345'}
import sys
import pyperclip
if len(sys.argv) < 2:
    print('Usage: python pw.py [account] - copy account password')
    sys.exit()

account = sys.argv[1] 
#sys.argv[]是用来获取命令行参数的，sys.argv[0]表示代码本身文件路径，所以参数从1开始
# first command line arg is the account name
print (account)

if account in PASSWORDS:
    pyperclip.copy(PASSWORDS[account])
    print('Password for ' + account + ' copied to clipboard.')
else:
    print('There is no account named ' + account)

#测试命令：打开CMD，输入py.exe + 文件名（绝对路径）+ 命令内容，
#比如：py.exe D:\python_work\口令保管箱.py email

执行结果：

email
Password for email copied to clipboard.
密码已到了剪切板：F7minlBDDuvMJuxESSKHFhTxFtjVB6