35.6. termios — POSIX 样式 tty 控制 ¶

此模块为 tty I/O 控制提供 POSIX 调用接口。对于这些调用的完整描述，见 termios(3) Unix 手册页面。它只可用于那些 Unix 版本，支持 POSIX termios 样式 tty I/O 控制 (在安装过程中配置)。

All functions in this module take a file descriptor fd as their first argument. This can be an integer file descriptor, such as returned by sys.stdin.fileno() ，或 文件对象 ，譬如 sys.stdin 本身。

This module also defines all the constants needed to work with the functions provided here; these have the same name as their counterparts in C. Please refer to your system documentation for more information on using these terminal control interfaces.

模块定义了下列函数：

termios. tcgetattr ( fd ) ¶

Return a list containing the tty attributes for file descriptor fd , as follows: [iflag, oflag, cflag, lflag, ispeed, ospeed, cc] where cc is a list of the tty special characters (each a string of length 1, except the items with indices VMIN and VTIME , which are integers when these fields are defined). The interpretation of the flags and the speeds as well as the indexing in the cc array must be done using the symbolic constants defined in the termios 模块。

termios. tcsetattr ( fd , when , attributes ) ¶

Set the tty attributes for file descriptor fd 从 attributes , which is a list like the one returned by tcgetattr() 。 when argument determines when the attributes are changed: TCSANOW to change immediately, TCSADRAIN to change after transmitting all queued output, or TCSAFLUSH to change after transmitting all queued output and discarding all queued input.

termios. tcsendbreak ( fd , duration ) ¶

Send a break on file descriptor fd . A zero duration sends a break for 0.25–0.5 seconds; a nonzero duration has a system dependent meaning.

termios. tcdrain ( fd ) ¶

Wait until all output written to file descriptor fd has been transmitted.

termios. tcflush ( fd , queue ) ¶

Discard queued data on file descriptor fd 。 queue selector specifies which queue: TCIFLUSH for the input queue, TCOFLUSH for the output queue, or TCIOFLUSH for both queues.

termios. tcflow ( fd , action ) ¶

Suspend or resume input or output on file descriptor fd 。 action argument can be TCOOFF to suspend output, TCOON to restart output, TCIOFF to suspend input, or TCION to restart input.

def getpass(prompt="Password: "):
    import termios, sys
    fd = sys.stdin.fileno()
    old = termios.tcgetattr(fd)
    new = termios.tcgetattr(fd)
    new[3] = new[3] & ~termios.ECHO          # lflags
    try:
        termios.tcsetattr(fd, termios.TCSADRAIN, new)
        passwd = input(prompt)
    finally:
        termios.tcsetattr(fd, termios.TCSADRAIN, old)
    return passwd
								

内容表

• 35.6. termios — POSIX 样式 tty 控制
  • 35.6.1. 范例

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