随机密码生成

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import sys
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import string
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import secrets
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alphabet = string.ascii_letters + string.digits
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punctuation = string.punctuation
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def random_passwd(length=18):
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  """随机生成指定位数的密码"""
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  passwd_table = alphabet + punctuation
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  while True:
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      passwd = ''.join(secrets.choice(passwd_table) for i in range(length))
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      if (any(p.islower() for p in passwd) and \
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          any(p.isupper() for p in passwd) and \
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          any(p in passwd for p in punctuation) and \
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          sum(p.isdigit() for p in passwd) >= 3):
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          return passwd
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if __name__ == '__main__':
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  length = int(sys.argv[1])
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  passwd = random_passwd(length)
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  print(f'\n{length}位随机密码: {passwd}')