"getpass" --- Portable password input
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**Source code:** Lib/getpass.py

======================================================================

Availability: not WASI.

This module does not work or is not available on WebAssembly. See
WebAssembly platforms for more information.

The "getpass" module provides two functions:

getpass.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 ("/dev/tty") or if that is
   unavailable to "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, "getpass()" falls back to
   printing a warning message to *stream* and reading from "sys.stdin"
   and issuing a "GetPassWarning".

   Nota:

     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.

   Nota:

     On Unix systems, when *echo_char* is set, the terminal will be
     configured to operate in *noncanonical mode*. Common terminal
     control characters are supported:

     * "Ctrl"+"A" - Move cursor to beginning of line

     * "Ctrl"+"E" - Move cursor to end of line

     * "Ctrl"+"K" - Kill (delete) from cursor to end of line

     * "Ctrl"+"U" - Kill (delete) entire line

     * "Ctrl"+"W" - Erase previous word

     * "Ctrl"+"V" - Insert next character literally (quote)

     * "Backspace"/"DEL" - Delete character before cursor

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

   Cambiato nella versione 3.14: Added the *echo_char* parameter for
   keyboard feedback.

   Cambiato nella versione 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 getpass.GetPassWarning

   A "UserWarning" subclass issued when password input may be echoed.

getpass.getuser()

   Return the "login name" of the user.

   This function checks the environment variables "LOGNAME", "USER",
   "LNAME" and "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 "pwd" module, otherwise, an "OSError" is raised.

   In general, this function should be preferred over "os.getlogin()".

   Cambiato nella versione 3.13: Previously, various exceptions beyond
   just "OSError" were raised.
