Another attempt to fix this problem cleanly

src/python/grpcio_tests/tests/bazel_namespace_package_hack.py

@@ -24,9 +24,6 @@ import sys
 # Analysis in depth: https://github.com/bazelbuild/rules_python/issues/55
 def sys_path_to_site_dir_hack():
     """Add valid sys.path item to site directory to parse the .pth files."""
-    # GRPC_BAZEL_BUILD is explicitly set by tools/bazel.rc.
-    if 'GRPC_BAZEL_BUILD' not in os.environ:
-        return
     for item in sys.path:
         if os.path.exists(item):
             # The only difference between sys.path and site-directory is

src/python/grpcio_tests/tests/interop/methods.py

@@ -13,8 +13,13 @@
 # limitations under the License.
 """Implementations of interoperability test methods."""
 
-from tests import bazel_namespace_package_hack
-bazel_namespace_package_hack.sys_path_to_site_dir_hack()
+# NOTE(lidiz) This module only exists in Bazel BUILD file, for more details
+# please refer to comments in the "bazel_namespace_package_hack" module.
+try:
+    from tests import bazel_namespace_package_hack
+    bazel_namespace_package_hack.sys_path_to_site_dir_hack()
+except ImportError:
+    pass
 
 import enum
 import json

src/python/grpcio_tests/tests/status/_grpc_status_test.py

@@ -13,8 +13,13 @@
 # limitations under the License.
 """Tests of grpc_status."""
 
-from tests import bazel_namespace_package_hack
-bazel_namespace_package_hack.sys_path_to_site_dir_hack()
+# NOTE(lidiz) This module only exists in Bazel BUILD file, for more details
+# please refer to comments in the "bazel_namespace_package_hack" module.
+try:
+    from tests import bazel_namespace_package_hack
+    bazel_namespace_package_hack.sys_path_to_site_dir_hack()
+except ImportError:
+    pass
 
 import unittest
 

tools/bazel.rc

@@ -5,7 +5,6 @@
 
 build --client_env=CC=clang
 build --copt=-DGRPC_BAZEL_BUILD
-build --action_env=GRPC_BAZEL_BUILD=1
 
 build:opt --compilation_mode=opt
 build:opt --copt=-Wframe-larger-than=16384