venv-pack for Packaging Python Virtual Environments

0.2.0 · active · verified Thu Apr 16

venv-pack (version 0.2.0) is a utility that packages Python virtual environments into a `.tar.gz` archive for easy redistribution. It aims to make deploying Python applications with their dependencies straightforward by creating a self-contained, relocatable environment. Releases are infrequent, with the last major update (0.2.0) released in August 2023.

Common errors

```
venv-pack: command not found
```
cause `venv-pack` is not installed, or its installation directory (e.g., `~/.local/bin`) is not included in your system's PATH environment variable.

fix Install it using `pip install venv-pack`. If already installed, ensure your shell environment's PATH includes the directory where pip installs executables.
```
Error: The specified path 'my_env' is not a virtual environment.
```
cause The directory provided to `venv-pack` does not appear to be a valid Python virtual environment, or the path is incorrect.

fix Verify the path to your virtual environment (e.g., `my_env`) is correct and that it was created using standard methods like `python -m venv` or `virtualenv`.
```
FileNotFoundError: [Errno 2] No such file or directory: 'my_env'
```
cause The input path to the virtual environment does not exist.

fix Double-check the spelling and existence of the virtual environment directory you are trying to pack.
```
PermissionError: [Errno 13] Permission denied: 'output.tar.gz'
```
cause You do not have write permissions in the directory where `venv-pack` is trying to create the output archive.

fix Run the command from a directory where you have write permissions, or specify an output path to a writable location (e.g., `venv-pack -o /tmp/my_app_env.tar.gz my_app_env`).

Warnings

gotcha Packed environments might not be universally portable across different operating systems or CPU architectures due to compiled dependencies. Always test on target systems.
Fix: Ensure target and source environments have compatible OS/architecture, or rely only on pure Python packages for maximum portability. `venv-pack` itself cannot solve fundamental binary compatibility issues.
gotcha Running `venv-pack` from *within* the virtual environment it is trying to pack can lead to unexpected behavior, such as `venv-pack` itself being included in the archive, increasing its size, or potential issues with environment state.
Fix: Always run `venv-pack` from *outside* the target virtual environment, specifying the environment's path as an argument (e.g., `venv-pack -o output.tar.gz my_env`).
gotcha If your virtual environment is non-standard (e.g., a custom Python executable path), the packed environment might fail to activate or run correctly on the target system.
Fix: Ensure the target system has a compatible Python interpreter available at a standard path. While `venv-pack` attempts to make paths relative where possible, certain custom setups may require manual adjustment post-unpacking.

Install

pip install venv-pack Install `venv-pack`

Imports

pack_venv_environment
```
from venv_pack import pack_venv_environment
```
While primarily a command-line tool, this function offers programmatic access to package an environment from Python code. Most users interact via the `venv-pack` command-line interface.

Quickstart

This quickstart demonstrates how to create a virtual environment, install a package into it, and then use `venv-pack` to compress it into a redistributable .tar.gz archive. The `venv-pack` command should ideally be run from outside the activated environment.

python3 -m venv my_app_env
source my_app_env/bin/activate
pip install requests
deactivate
venv-pack -o my_app_env.tar.gz my_app_env
ls -lh my_app_env.tar.gz

view raw JSON →