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ZYnXe	ZdS)aUtilities to get a password and/or the current user name.

getpass(prompt[, stream]) - Prompt for a password, with echo turned off.
getuser() - Get the user name from the environment or password database.

GetPassWarning - This UserWarning is issued when getpass() cannot prevent
                 echoing of the password contents while reading.

On Windows, the msvcrt module will be used.

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r|dk	rz||k	r|jt||}YnX|jd|SQRXdS)aPrompt for a password, with echo turned off.

    Args:
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      stream: A writable file object to display the prompt.  Defaults to
              the tty.  If no tty is available defaults to sys.stderr.
    Returns:
      The seKr3t input.
    Raises:
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      GetPassWarning: When we were unable to turn echo off on the input.

    Always restores terminal settings before returning.
    Nz/dev/ttyzw+TCSASOFT)input
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r1cCstjtjk	rt||Sx|D]}tj|qWd}xHtj}|dksL|dkrNP|dkrZt|dkrp|dd}q4||}q4Wtjdtjd|S)	z9Prompt for password with echo off, using Windows getch().
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r<cCs0tjdtdd|stj}td|dt||S)Nz%Can not control echo on the terminal.)
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linerrr	r&s&r&cCs<x dD]}tjj|}|r|SqWddl}|jtjdS)zGet the username from the environment or password database.

    First try various environment variables, then the password
    database.  This works on Windows as long as USERNAME is set.

    LOGNAMEUSERLNAMEUSERNAMErN)rLrMrNrO)renvirongetpwdgetpwuidgetuid)nameuserrRrrr	rs
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