An auto-login script for npm command line (powered by pexpect)

npm-login.py

#!/usr/bin/env python
from __future__ import print_function
import sys
from pexpect import spawn, EOF


def main():
    user_table = {
        'username': ('username', 'password', 'email')
        # ...
    }
    if len(sys.argv) < 2:
        print('Usage: npm-login username')
        return
    key = sys.argv[1]
    if key not in user_table:
        print('User "{}" not found, below users are accepted:'.format(key))
        print(user_table.keys())
        return

    username, password, email = user_table[key]
    child = spawn('npm adduser')
    child.logfile_read = sys.stdout
    child.expect('Username:')
    child.sendline(username)
    child.expect('Password:')
    child.sendline(password)
    child.expect('Email:*')
    child.sendline(email)
    child.expect('Logged in*')
    child.expect(EOF)


if __name__ == '__main__':
    main()