.. module:: getpass :synopsis: Portable reading of passwords and retrieval of the userid.
.. moduleauthor:: Piers Lauder <piers@cs.su.oz.au>
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
Source code: :source:`Lib/getpass.py`
The :mod:`getpass` module provides two functions:
.. function:: getpass(prompt='Password: ', stream=None) Prompt the user for a password without echoing. The user is prompted using the string *prompt*, which defaults to ``'Password: '``. On Unix, the prompt is written to the file-like object *stream* using the replace error handler if needed. *stream* defaults to the controlling terminal (:file:`/dev/tty`) or if that is unavailable to ``sys.stderr`` (this argument is ignored on Windows). If echo free input is unavailable getpass() falls back to printing a warning message to *stream* and reading from ``sys.stdin`` and issuing a :exc:`GetPassWarning`. .. note:: If you call getpass from within IDLE, the input may be done in the terminal you launched IDLE from rather than the idle window itself.
.. exception:: GetPassWarning A :exc:`UserWarning` subclass issued when password input may be echoed.
.. function:: getuser() Return the "login name" of the user. This function checks the environment variables :envvar:`LOGNAME`, :envvar:`USER`, :envvar:`LNAME` and :envvar:`USERNAME`, in order, and returns the value of the first one which is set to a non-empty string. If none are set, the login name from the password database is returned on systems which support the :mod:`pwd` module, otherwise, an exception is raised. In general, this function should be preferred over :func:`os.getlogin()`.
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