byper 1.0.4

Byper is a Python environment and workflow manager.

Byper

Byper is a Python environment and workflow manager. Each project uses its own local environment ( packages/ ), a declarative manifest ( requirements.yaml ), and a reproducible lockfile ( byper.lock ). You don't need to activate or deactivate environments: every byper command automatically uses your project's Python and dependencies.

• Local environment with venv (packages/)
• Dependencies declared in requirements.yaml
• Lockfile with hashes and PyPI metadata
• Built-in Python version management
• Scripts, tasks, and environment variables in a single file
• Global shims in ~/.byper/bin/

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Installation

Install Byper like any other Python package:

pip install byper

Or from source:

git clone https://github.com/brayhandeaza/byper.git
cd byper/apps/python/byper
pip install -e .

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Getting Started

1. Create a project

byper init my-project

To skip the interactive wizard and use defaults:

byper init my-project -y

This creates the following structure:

my-project/
├── requirements.yaml
├── main.py
└── packages/          # created after running byper install

2. Install dependencies

Edit requirements.yaml :

name: my-project
version: 0.0.1
description: My first Byper project

python: "3.12"

dependencies:
  requests: "2.32.5"
  fastapi: "0.116.1"

Then install:

byper install

Byper will:

1. Find a compatible Python interpreter (download it if necessary).
2. Create the local environment packages/.
3. Install dependencies from PyPI.
4. Generate byper.lock with exact versions, URLs, and hashes.

3. Run code with the project environment

byper main.py

No need for source packages/bin/activate ; byper runs main.py with the Python from packages/ .

4. Add more dependencies

byper install pydantic

With an exact version:

byper install "pydantic==2.9.0"

Upgrade a package:

byper install requests --upgrade

Remove:

byper remove requests

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Python version management

You can pin the Python version in requirements.yaml :

python: "3.12"          # any 3.12.x
python: "3.12.4"        # exact
python: ">=3.12,<3.13"  # range
python: "^3.12"         # compatible release

If you don't have the required version, byper can download it automatically from python-build-standalone :

byper python install 3.12.8

List installed runtimes:

byper python list

Set a version for the project:

byper python use 3.12

This writes python: "3.12" to requirements.yaml .

Global shims

Every time you install a runtime, byper creates shims in ~/.byper/bin/ :

~/.byper/bin/python
~/.byper/bin/python3
~/.byper/bin/python3.12
~/.byper/bin/python3.12.8
~/.byper/bin/pip
~/.byper/bin/pip3
~/.byper/bin/pip3.12

Add ~/.byper/bin to your PATH to use these commands from anywhere.

On Unix:

export PATH="$HOME/.byper/bin:$PATH"

On Windows (CMD):

setx PATH "%PATH%;%USERPROFILE%\.byper\bin"

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Scripts and tasks

Define scripts in requirements.yaml :

scripts:
  start: python main.py
  test: python -m pytest
  lint: python -m ruff check .

Run them:

byper run start
byper run test

Tasks allow more elaborate step sequences:

tasks:
  deploy:
    - byper run test
    - { call: src.deploy.run, kwargs: { env: prod } }
    - { file: scripts/finalize.py }

Run:

byper task deploy

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Environment variables

Declare variables inline or load them from a .env file:

env:
  from_file: .env
  DEBUG: "true"
  API_URL: https://api.example.com

Access them from Python:

from byper.env import DEBUG, API_URL

They are also injected automatically into os.environ .

Regenerate stubs so your editor recognizes them:

byper refresh

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Lockfile

requirements.yaml expresses the project's intent. byper.lock stores the exact resolution:

lock_version: 1

python:
  required: ">=3.12,<3.13"
  resolved: "3.12.8"
  implementation: "CPython"

packages:
  "requests@2.32.5":
    name: "requests"
    version: "2.32.5"
    source: "pypi"
    resolved: "https://files.pythonhosted.org/..."
    integrity: "sha256:..."
    direct: true
    group: "main"
    dependencies:
      charset-normalizer: ">=2.0.0,<4.0.0"

When byper.lock is in sync with requirements.yaml , byper install uses the lockfile for a faster, reproducible install.

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Main commands

Command	Description
byper install [--offline]	Install/update dependencies from requirements.yaml
byper install [packages] [--upgrade] [--offline] [--no-cache]	Install dependencies or specific packages
byper remove <pkg>	Remove a package
byper run <script>	Run a manifest script
byper task <name>	Run a manifest task
byper <file.py>	Run a Python file with the local environment
byper list [--outdated | --freeze | --cache]	List installed packages
byper tree	Show directory tree (hiding packages/ )
byper reset [-y]	Rebuild packages/ from scratch
byper doctor [--fix]	Diagnose and repair the environment
byper build	Build the package with python -m build
byper publish	Upload the package to PyPI
byper login / byper logout	Manage PyPI credentials
byper cache <list|clear|dir>	Manage pip cache
byper wheel <pkg>	Build a wheel for a package
byper python install <version>	Download and install a Python runtime
byper python list	List installed runtimes
byper python use <version>	Pin the project's Python version
byper refresh	Regenerate .pyi stubs for tasks and env

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Typical workflow

# 1. Create project
byper init my-api -y

# 2. Enter directory
cd my-api

# 3. Pick Python
byper python use 3.12

# 4. Add dependencies
byper install fastapi
byper install "uvicorn[standard]"

# 5. Write code in main.py
# ...

# 6. Run
byper run start
# or directly
byper main.py

# 7. Diagnose environment issues
byper doctor

# 8. Publish (optional)
byper build
byper publish

---

Project structure

my-project/
├── requirements.yaml    # project manifest
├── byper.lock          # exact dependency resolution
├── packages/           # local environment (venv)
├── main.py             # entry point (optional)
├── src/                # source code
└── tests/              # tests

• Do not commit packages/ to git.
• Commit requirements.yaml and byper.lock for reproducibility.

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Additional documentation

• docs/manifest.md — full requirements.yaml format
• docs/commands.md — complete command reference
• docs/tasks-and-env.md — tasks and environment variables
• docs/publishing.md — build and publish to PyPI
• docs/development.md — internal architecture for contributors
• docs/ESTADO.md — current status and roadmap

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Contributing

Contributions are welcome. See docs/development.md to understand the codebase and how to run the tests.

cd apps/python/byper
python -m pytest

Performance tests ( pytest -m performance ) require network access and are not run by default.