fix: Fix namespace packages conflict issue #757
Merged
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This fixes the googleapis/gapic-generator#3334 by excluding system-wide site-packages dir from python packages resolution path completely.
It is done by simply setting
PYTHONNOUSERSITE
environment variable and then "re-running" python interpreter replacing the current process, but this time with the site packages excluded.This pretty much implements the long-standing featrue request for rules_python bazelbuild/bazel#4939, but only in scope of gapic-generator-python.