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Understanding Package Metadata for Python Synchronization

To ensure smooth synchronization of Python packages, it’s crucial to understand the metadata requirements. This article outlines the necessary metadata fields and their expected formats. We’ll also provide examples of different tools, such as Twine and native Python packaging utilities, to help you prepare your package correctly.

Standard Metadata

Standard metadata refers to the basic information required for any Python package. This includes:

  • Name: The package name, which must be unique and conform to Python naming conventions.
  • Version: The package version, following PEP 440 versioning scheme.
  • Filetype: Indicates whether the package is a source distribution (sdist) or a binary distribution (bdist).
  • Python Version: The Python version(s) the package is compatible with.
  • Platform: The target platform for the package, e.g., Windows, Linux, macOS. Use “any” for platform-independent packages.



When using Twine to upload your package, ensure your or pyproject.toml includes the necessary metadata:

    description='An example package',
        'Programming Language :: Python :: 3',
        'Operating System :: OS Independent',

Native Python

For native Python packaging without Twine, the same metadata applies. Ensure your or pyproject.toml file is correctly populated:

name = "example_package"
version = "0.1.0"
description = "An example package"
requires-python = ">=3.6"
classifiers = [
    "Programming Language :: Python :: 3",
    "Operating System :: OS Independent",

Additional Metadata

Additional metadata provides more context about the package, enhancing discoverability and usability.

  • Summary: A short, one-line summary of the package.
  • Description: A longer description of the package. This can be detailed and may include HTML for formatting.
  • License: The license under which the package is distributed.
  • Home Page: URL to the project’s home page.
  • Download URL: URL from where the package can be downloaded.
  • Author: The name of the package author.
  • Author Email: The email address of the package author.
  • Maintainer: The name of the current maintainer, if different from the author.
  • Maintainer Email: The email address of the current maintainer.



When preparing your package with Twine, include additional metadata in your or pyproject.toml:

    author='Jane Doe',

Native Python

For native packaging, the pyproject.toml can also include these additional fields:

authors = [{name = "Jane Doe", email = ""}]
license = "MIT"
urls = {
    "Homepage" = "",
    "Download" = ""


Properly defining your package’s metadata is crucial for successful synchronization and distribution. By following the guidelines above and using the examples as a template, you can ensure your package is correctly recognized and processed correctly.

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