pexpect

Pexpect allows easy control of interactive console applications.

pexpect Permissive license ISC license AGING ★ 2,847 v4.9.0 released 2023-11-25

Install

pexpect on PyPI

pip

pip install pexpect

uv

uv add pexpect

poetry

poetry add pexpect

Package facts

License	ISC license (permissive)
Python support	not specified
Install friction	low — pure-Python wheel
Runtime dependencies	1 — ptyprocess
Maintenance	aging — 992 days since the last release
Last repo commit	2025-04-11
First released	2008-08-18
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: pexpect-4.9.0-py2.py3-none-any.whl

Development Status :: 5 - Production/StableEnvironment :: ConsoleIntended Audience :: DevelopersIntended Audience :: System AdministratorsLicense :: OSI Approved :: ISC License (ISCL)Operating System :: MacOS :: MacOS XOperating System :: POSIXProgramming Language :: PythonProgramming Language :: Python :: 2.7Programming Language :: Python :: 3Topic :: Software DevelopmentTopic :: Software Development :: Libraries :: Python ModulesTopic :: Software Development :: Quality AssuranceTopic :: Software Development :: TestingTopic :: SystemTopic :: System :: Archiving :: PackagingTopic :: System :: Installation/SetupTopic :: System :: ShellsTopic :: System :: Software DistributionTopic :: Terminals

About pexpect

from the package's own PyPI description — quoted content, verbatim

Pexpect is a pure Python module for spawning child applications; controlling them; and responding to expected patterns in their output. Pexpect works like Don Libes' Expect. Pexpect allows your script to spawn a child application and control it as if a human were typing commands.

Pexpect can be used for automating interactive applications such as ssh, ftp, passwd, telnet, etc. It can be used to automate setup scripts for duplicating software package installations on different servers. It can be used for automated software testing. Pexpect is in the spirit of Don Libes' Expect, but Pexpect is pure Python.

The main features of Pexpect require the pty module in the Python standard library, which is only available on Unix-like systems. Some features—waiting for patterns from file descriptors or subprocesses—are also available on Windows.

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

Pexpect spawns and controls child applications interactively, automating responses to expected output patterns. It enables scripting of interactive programs like ssh, ftp, and telnet as if a human were typing commands.

Low friction: pure Python wheel with a single runtime dependency (ptyprocess). Maintenance is aging—last release was 992 days ago—but the repository remains active with recent commits and 2847 stars, suggesting stable, established code.

ISC license is permissive and imposes minimal restrictions; you may use, modify, and distribute pexpect with few obligations beyond retaining the license notice.

Usage

pip install pexpect

import pexpect
child = pexpect.spawn('ssh user@host')
child.expect('password:')
child.sendline('mypassword')

Requires Unix-like system (Linux, macOS, BSD) for full functionality; pty module is not available on Windows, though some features work there.

Verdict: Pexpect is a stable, well-established library for automating interactive terminal applications. Its permissive ISC license, low install friction, and zero known vulnerabilities make it safe to adopt. The aging maintenance status (992 days since last release) reflects maturity rather than abandonment—the codebase is production-stable and actively maintained. Best suited for Unix-like systems; Windows support is partial.

Needs verification

Whether the package's Python 2.7 classifier reflects actual support or is outdated documentation
Current test coverage and whether the aging release cycle indicates sufficient maintenance for new Python versions

spawn child process automationinteractive application controlexpect-like pattern matchingssh automation scriptingterminal interaction automationsubprocess expect libraryautomated interactive testing