import subprocess
import sys
from randpass import gen_pass

def adduser(username,password,fname):
    data = """user information:
%s:%s
"""
    subprocess.call('useradd %s' % username,shell=True) #subprocess.call,可以使用所有的shell命令
    subprocess.call(
        'echo %s | passwd --stdin %s' % (password,username),
        shell=True
    )
    with open(fname,'a') as fobj:
        fobj.write(data % (username,password))

if __name__ == '__main__':
    username = sys.argv[1]
    password = gen_pass
    adduser(username,password,'/tmp/user.txt')

#python3 adduser.py john