### 导航 - [索引](../genindex.xhtml "总目录") - [模块](../py-modindex.xhtml "Python 模块索引") | - [下一页](fcntl.xhtml "fcntl --- The fcntl and ioctl system calls") | - [上一页](tty.xhtml "tty --- 终端控制功能") | -  - [Python](https://www.python.org/) » - zh\_CN 3.7.3 [文档](../index.xhtml) » - [Python 标准库](index.xhtml) » - [Unix 专有服务](unix.xhtml) » - $('.inline-search').show(0); | # [`pty`](#module-pty "pty: Pseudo-Terminal Handling for Linux. (Linux)") --- Pseudo-terminal utilities **Source code:** [Lib/pty.py](https://github.com/python/cpython/tree/3.7/Lib/pty.py) \[https://github.com/python/cpython/tree/3.7/Lib/pty.py\] - - - - - - The [`pty`](#module-pty "pty: Pseudo-Terminal Handling for Linux. (Linux)") module defines operations for handling the pseudo-terminal concept: starting another process and being able to write to and read from its controlling terminal programmatically. Because pseudo-terminal handling is highly platform dependent, there is code to do it only for Linux. (The Linux code is supposed to work on other platforms, but hasn't been tested yet.) The [`pty`](#module-pty "pty: Pseudo-Terminal Handling for Linux. (Linux)") module defines the following functions: `pty.``fork`()Fork. Connect the child's controlling terminal to a pseudo-terminal. Return value is `(pid, fd)`. Note that the child gets *pid* 0, and the *fd* is *invalid*. The parent's return value is the *pid* of the child, and *fd* is a file descriptor connected to the child's controlling terminal (and also to the child's standard input and output). `pty.``openpty`()Open a new pseudo-terminal pair, using [`os.openpty()`](os.xhtml#os.openpty "os.openpty") if possible, or emulation code for generic Unix systems. Return a pair of file descriptors `(master, slave)`, for the master and the slave end, respectively. `pty.``spawn`(*argv*\[, *master\_read*\[, *stdin\_read*\]\])Spawn a process, and connect its controlling terminal with the current process's standard io. This is often used to baffle programs which insist on reading from the controlling terminal. The functions *master\_read* and *stdin\_read* should be functions which read from a file descriptor. The defaults try to read 1024 bytes each time they are called. 在 3.4 版更改: [`spawn()`](#pty.spawn "pty.spawn") now returns the status value from [`os.waitpid()`](os.xhtml#os.waitpid "os.waitpid")on the child process. ## 示例 The following program acts like the Unix command *script(1)*, using a pseudo-terminal to record all input and output of a terminal session in a "typescript". ``` import argparse import os import pty import sys import time parser = argparse.ArgumentParser() parser.add_argument('-a', dest='append', action='store_true') parser.add_argument('-p', dest='use_python', action='store_true') parser.add_argument('filename', nargs='?', default='typescript') options = parser.parse_args() shell = sys.executable if options.use_python else os.environ.get('SHELL', 'sh') filename = options.filename mode = 'ab' if options.append else 'wb' with open(filename, mode) as script: def read(fd): data = os.read(fd, 1024) script.write(data) return data print('Script started, file is', filename) script.write(('Script started on %s\n' % time.asctime()).encode()) pty.spawn(shell, read) script.write(('Script done on %s\n' % time.asctime()).encode()) print('Script done, file is', filename) ``` ### 导航 - [索引](../genindex.xhtml "总目录") - [模块](../py-modindex.xhtml "Python 模块索引") | - [下一页](fcntl.xhtml "fcntl --- The fcntl and ioctl system calls") | - [上一页](tty.xhtml "tty --- 终端控制功能") | -  - [Python](https://www.python.org/) » - zh\_CN 3.7.3 [文档](../index.xhtml) » - [Python 标准库](index.xhtml) » - [Unix 专有服务](unix.xhtml) » - $('.inline-search').show(0); | © [版权所有](../copyright.xhtml) 2001-2019, Python Software Foundation. Python 软件基金会是一个非盈利组织。 [请捐助。](https://www.python.org/psf/donations/) 最后更新于 5月 21, 2019. [发现了问题](../bugs.xhtml)？ 使用[Sphinx](http://sphinx.pocoo.org/)1.8.4 创建。