Introduction

Versioning is an essential aspect of software development. Proper versioning allows developers to track changes, ensure compatibility, and manage dependencies effectively. In Python, embedding version information directly into a package is a common practice and is critical for both developers and users. This article explores the standard ways to embed version information in a Python package, focusing on technical explanations and examples.

Why Embed Version Information?

Embedding version information into a package serves several purposes:

1. Identification: It helps identify the specific version of a package, which is crucial for troubleshooting and in cases where multiple versions might be present.
2. Dependency Management: Tools like pip rely on version information to manage dependencies.
3. Compatibility: Developers can specify compatibility with other packages or libraries using version constraints.
4. Changelogs: Versioning assists in creating accurate and detailed changelogs, important for transparency with users.

Standard Ways to Embed Version Information

Using __version__ in a Module

The simplest and most widely used method to embed version information is to define a __version__ variable in a module.

Example:

• Pros: Easy to implement, and it keeps the version information within the context of the code.
• Cons: Requires manual updates when a new version is released.
• Pros: Separation of code and versioning, making automation easier (e.g., scripts can update the version).
• Cons: Slightly more complex, as it involves reading from a file.
• Pros: Automates versioning based on git tags, reducing human error.
• Cons: Requires the package to be in an SCM repository and an understanding of how setuptools_scm works.
• CI/CD Integration: Integrate version bumps within Continuous Integration/Continuous Deployment pipelines to automate version updates upon merging or releasing.
• Git Hooks: Use pre-commit or pre-release git hooks to ensure the version is incremented before pushing changes to a remote.