wurlitzer
Capture C-level output in context managers
Decision gist · record as of 2026-08-14
Yes. Wurlitzer solves a specific, hard problem (capturing C-level I/O) with a clean API, has no dependencies, is actively maintained, carries an MIT license, and has no known vulnerabilities. Install it if you work with native extensions, compiled libraries, or need output capture in Jupyter—otherwise it's not necessary.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.5 or later; os.dup2 is Unix-like systems only (Linux, macOS, BSD), not available on Windows.
- Low friction: pure Python wheel with no runtime dependencies.
- Actively maintained with recent commits and a stable release history since 2016.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
last release 2024-06-12 (793 days) · last repo commit 2026-07-06 · 222 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,832,013 downloads/mo, #3,510 on PyPI
Alternatives
Verify before relying
pip install wurlitzer
from wurlitzer import pipes
with pipes() as (out, err):
call_some_c_function()
stdout_text = out.read()- Whether the package works correctly on all modern Python versions up to 3.12+ despite the 3.5 minimum requirement.
- Performance overhead or GIL interaction when capturing high-volume C output in production workloads.
What it is and what it does
Wurlitzer lets you capture output produced directly by C code and native libraries—output that normally bypasses Python's sys.stdout and sys.stderr. It works by using os.dup2 to redirect file descriptors at the OS level, making it possible to intercept output from compiled extensions, system calls, and third-party C libraries that write directly to stdout/stderr.
The package provides context managers (pipes, sys_pipes) and integrates with Python's logging module and file objects. It's particularly useful in Jupyter notebooks and IPython environments where you want to display C-level output in cell results, and in testing scenarios where you need to verify or suppress output from native code.
Use it for
- Capture and verify output from C extensions or compiled libraries in unit tests.
- Display C-level output in Jupyter notebooks by enabling the wurlitzer IPython extension.
- Redirect native library output to Python loggers for centralized log management.
- Suppress or forward output from blocking C functions that hold the GIL.
- Debug integration issues between Python and native code by inspecting captured output.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Wurlitzer solves a specific, hard problem (capturing C-level I/O) with a clean API, has no dependencies, is actively maintained, carries an MIT license, and has no known vulnerabilities. Install it if you work with native extensions, compiled libraries, or need output capture in Jupyter—otherwise it's not necessary.
Install
wurlitzer on PyPI
Before you install
Low friction: pure Python wheel with no runtime dependencies. Actively maintained with recent commits and a stable release history since 2016.
Requires Python 3.5 or later; os.dup2 is Unix-like systems only (Linux, macOS, BSD), not available on Windows.
License in practice
MIT license is permissive; you can use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
Quickstart
pip install wurlitzer
from wurlitzer import pipes
with pipes() as (out, err):
call_some_c_function()
stdout_text = out.read()Verify before relying
- Whether the package works correctly on all modern Python versions up to 3.12+ despite the 3.5 minimum requirement.
- Performance overhead or GIL interaction when capturing high-volume C output in production workloads.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.5 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 793 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,832,013 / month, #3,510 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3 |
Evidence: wurlitzer-3.1.1-py3-none-any.whl
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