getpass.py 文件源码

def win_getpass(prompt='Password: ', stream=None):
    """Prompt for password with echo off, using Windows getch()."""
    if sys.stdin is not sys.__stdin__:
        return fallback_getpass(prompt, stream)
    import msvcrt
    for c in prompt:
        msvcrt.putch(c)
    pw = ""
    while 1:
        c = msvcrt.getch()
        if c == '\r' or c == '\n':
            break
        if c == '\003':
            raise KeyboardInterrupt
        if c == '\b':
            pw = pw[:-1]
        else:
            pw = pw + c
    msvcrt.putch('\r')
    msvcrt.putch('\n')
    return pw