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Speed up imports by using importlib instead of pkg_resources

Leo P. Singer requested to merge leo-singer/lalsuite:importlib-resources into master

Description

Speed up imports by up to a second by replacing uses of pkg_resources with the new Python standard library module importlib.resources (or, for Python < 3.7, the backport importlib_resources). The old pkg_resources module is known to be slow because it does a lot of work on startup.

See, for example, pypa/setuptools#926 and pypa/setuptools#510.

API Changes and Justification

Backwards Compatible Changes

  • This change introduces no API changes
  • This change adds new API calls

Backwards Incompatible Changes

  • This change modifies an existing API
  • This change removes an existing API

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

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Edited by Ghost User

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