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