yprint

yprint prefixes stdout/stderr lines with a colored call stack breadcrumb. It does this by preloading a small C shim that intercepts writes and lets the Python runtime update a per-thread prefix.

Install

pip install yprint

Usage

yprint -- python your_script.py
yprint -- bash -c 'python your_script.py'

Options

  • --only PATH (repeatable): Only show frames under the given path(s).
  • --prefix-width N: Fixed width for the prefix column.

Environment

  • YPRINT_ONLY: Colon-separated list of allowed paths (same as --only).
  • YPRINT_PREFIX_WIDTH: Fixed width for the prefix column.
  • YPRINT_COLOR: always or never to force color on/off.
  • YPRINT_CACHE_DIR: Override where the preload library is compiled.
  • YPRINT_ENABLE: Set to 1 to auto-enable via sitecustomize.

yprint compiles the preload library on first run; a C compiler (cc) must be available.

Dev / Release

pip install -e ".[dev]"
python -m build
python -m twine upload dist/*

Key dates

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Latest release

1 maintainer

PyPI data
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Requires

Python >=3.8

Provides Extra

dev

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