slipcover

library1.0.18pypypi✓ verified 79d ago

Near zero-overhead Python code coverage tool that uses bytecode instrumentation to measure line and branch coverage with minimal performance impact. Current version 1.0.18, supports Python 3.8 to 3.14, maintained actively on GitHub.

testing devops

pip install slipcover

github ↗package ↗

INSTALL

IMPORT

SIG · SLIPCOVER

slipcover

testingpythonv1.0.18

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Slipcover

✓ from slipcover import Slipcover

✗ from slipcover import SlipCover

Basic usage: start/stop coverage and print summary

from slipcover import SlipCover sc = SlipCover() sc.start() # run code to be measured sc.stop() print(sc.report())

slipcover --version

Debug

Known issues

breakingPython 3.8 is required minimum, Python 3.15+ is not supported (requires_python: <3.15,>=3.8).

fix

Use Python 3.8 to 3.14.

affects: <3.8 or >=3.15

gotchaSlipCover uses a C extension (`probe.abi3.so`). On macOS >14.2, wheels may cause dlopen errors like 'bad bind opcode 0x00'. Upgrade to >=1.0.12.

fix

pip install --upgrade slipcover>=1.0.12

affects: <1.0.12 on macOS >14.2

gotchaThe `--omit` flag does not work with `--source` prior to v1.0.18. Combining them may omit nothing.

fix

Upgrade to >=1.0.18 or use separate `--source` and `--omit` invocations.

affects: <1.0.18

Upgrade

Version history

1.0.18latest on PyPI · released Mar 17, 2026

Audit

Dependencies

coverageoptionalSlipCover's output XML and JSON are compatible with coverage.py's report formats

pytest-xdistoptionalSlipCover supports parallel test execution with pytest-xdist since v1.0.18

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/plasma-umass/slipcover ↗

packagehttps://pypi.org/project/slipcover/ ↗