extensionclass 4.5.1 for python39 = Metaclass for subclassable extension types

Project license:
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ZPL 2.1
Custom Python tests:
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import ExtensionClass
import MethodObject
import ComputedAttribute
Custom Nix configuration:
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{
  buildGccBin = true;
  buildSetuptools_57_5_0 = true;
}
Try it out: Install extensionclass's command line applications in your system: Use many Python projects together: