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The python target requires two configuration entries:

  • module - the name of the generated Python module, which will be used by users in import directives.
  • distName - the PyPI distribution name for the package.
  • classifiers - a list of trove classifiers to declare on the package. It is the user's responsibility to specify valid values (the authoritative list of valid trove classifiers is defined in the pypa/trove-classifiers package).
  • Some classifiers are automatically included (and should not be added to the classifiers property) based on relevant configuration from the package.json file:
    • Development Status :: is determined based on the package's stability
    • License :: is determined based on the package's license
    • Operating System :: OS Independent is always set
    • Typing :: Typed is always set
  • Additionally, the following Programming Language :: classifiers are already set (more could be added by the user if relevant):
    • Programming Language :: Python :: 3 :: Only
    • Programming Language :: Python :: 3.8
    • Programming Language :: Python :: 3.9
    • Programming Language :: Python :: 3.10
    • Programming Language :: Python :: 3.11


  "jsii": {
    "targets": {
      "python": {
        "module": "hello_jsii",   // Required
        "distName": "hello-jsii", // Required
        "classifiers": [          // Optional
          "Framework :: AWS CDK",
          "Framework :: AWS CDK :: 1"
      // ...
    // ...
  // ...

The resulting package can be published to PyPI.

Prerelease Versions

The original npm package may feature a version number that includes a SemVer 2.0-compliant prerelease identifer (e.g: 1.2.3-pre.4). Python packages distributed to PyPI must however use a different format to express prerelease versions, as specified in PEP-440. In order to generate valid packages, only certain prerelease identifiers are accepted by jsii-pacmak, and are translated according to the following table:

Source Version (npm) Python Version (PEP-440) Notes
X.Y.Z-dev.N X.Y.Z.devN Development, iteration N.
X.Y.Z-pre.N X.Y.Z.devN Development, iteration N
X.Y.Z-alpha.N X.Y.Z.aN Alpha release, iteration N
X.Y.Z-beta.N X.Y.Z.bN Beta release, iteration N
X.Y.Z-rc.N X.Y.Z.rcN Release candidate, iteration N