@require_root<EOL>def change_password(username, new_password):
assert username in passwd_reader.load_users(),"<STR_LIT>" % username<EOL>sh.ftpasswd(<EOL>"<STR_LIT>",<EOL>passwd=True,        <EOL>name=username,<EOL>stdin=True,         <EOL>file=settings.LOGIN_FILE,<EOL>_in=new_password<EOL>)<EOL>reload_configuration()<EOL>
Change password for given `username`.

Args:
    username (str): User's name.
    new_password (str): User's new password.