fix: Make gapic-generator-python compatible with protobuf 3.14.0 (native namespace package) #753
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More details about Python namespace packaging here: https://packaging.python.org/guides/packaging-namespace-packages/#native-namespace-packages
The protobuf changes, which made this fix necessary are here:
protocolbuffers/protobuf#7902
protocolbuffers/protobuf#7908
The tracking bug for this issue (probably not the only one) googleapis/gapic-generator#3334
This is only part of the fix, for the proper fix other google-namespaced python packages must be migrated to pkgutil-style-namespace-packages and make sure they do not have
namespace_packages
in theirsetup.py
file (an artifact from the legacypkg_resources-style
packages)