Maven build is generating protobuf messages for Typeshed symbols from a python script (see typeshed_serializer). In order for it to work properly it needs to have Python runtime and Typeshed available.
git submodule update --initto retrieve Typeshed as a Git submodule
mvn clean install: execute full build, run tests for typeshed_serializer
mvn clean install -DskipTypeshed: avoid running typeshed_serializer tests and build only Java maven modules
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