docs: def change_password(username, new_password):
      """
      Change password for given `username`.
  
      Args:
          username (str): User's name.
          new_password (str): User's new password.
      """
      assert username in passwd_reader.load_users(),\
             "Username '%s' not found!" % username
  
      sh.ftpasswd(
          "--change-password",
          passwd=True,        # passwd file, not group file
          name=username,
          stdin=True,         # tell ftpasswd to read password from stdin
          file=settings.LOGIN_FILE,
          _in=new_password
      )
  
      reload_configuration()