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Doc/library/getpass.rst
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:mod:`!getpass` --- Portable password input
===========================================

.. module:: getpass
   :synopsis: Portable reading of passwords and retrieval of the userid.

**Source code:** :source:`Lib/getpass.py`

--------------

.. include:: ../includes/wasm-notavail.rst

The :mod:`!getpass` module provides two functions:

.. function:: getpass(prompt='Password: ', stream=None, *, echo_char=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 :data:`sys.stderr` (this
   argument is ignored on Windows).

   The *echo_char* argument controls how user input is displayed while typing.
   If *echo_char* is ``None`` (default), input remains hidden. Otherwise,
   *echo_char* must be a single printable ASCII character and each
   typed character is replaced by it. For example, ``echo_char='*'`` will
   display asterisks instead of the actual input.

   If echo-free input is unavailable, :func:`getpass` falls back to printing
   a warning message to *stream* and reading from :data:`sys.stdin` and
   issuing a :exc:`GetPassWarning`.

   .. note::
      If you call :func:`getpass` from within IDLE, the input may be done in the
      terminal you launched IDLE from rather than the idle window itself.

   .. note::
      On Unix systems, when *echo_char* is set, the terminal will be
      configured to operate in
      :manpage:`noncanonical mode <termios(3)#Canonical_and_noncanonical_mode>`.
      Common terminal control characters are supported:

      * :kbd:`Ctrl+A` - Move cursor to beginning of line
      * :kbd:`Ctrl+E` - Move cursor to end of line
      * :kbd:`Ctrl+K` - Kill (delete) from cursor to end of line
      * :kbd:`Ctrl+U` - Kill (delete) entire line
      * :kbd:`Ctrl+W` - Erase previous word
      * :kbd:`Ctrl+V` - Insert next character literally (quote)
      * :kbd:`Backspace`/:kbd:`DEL` - Delete character before cursor

      These shortcuts work by reading the terminal's configured control
      character mappings from termios settings.

   .. versionchanged:: 3.14
      Added the *echo_char* parameter for keyboard feedback.

   .. versionchanged:: 3.15
      When using non-empty *echo_char* on Unix, keyboard shortcuts (including
      cursor movement and line editing) are now properly handled using the
      terminal's control character configuration.

.. 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 :exc:`OSError`
   is raised.

   In general, this function should be preferred over :func:`os.getlogin`.

   .. versionchanged:: 3.13
      Previously, various exceptions beyond just :exc:`OSError` were raised.