Don't clutter __init__.py quite as much

src/python/grpcio/grpc/__init__.py

@@ -2021,58 +2021,7 @@ class Compression(enum.IntEnum):
     Gzip = _compression.Gzip
 
 
-def _uninstalled_protos(*args, **kwargs):
+from grpc._runtime_protos import protos, services, protos_and_services
-    raise NotImplementedError(
-        "Install the grpcio-tools package to use the protos function.")
-
-
-def _uninstalled_services(*args, **kwargs):
-    raise NotImplementedError(
-        "Install the grpcio-tools package to use the services function.")
-
-
-def _uninstalled_protos_and_services(*args, **kwargs):
-    raise NotImplementedError(
-        "Install the grpcio-tools package to use the protos_and_services function."
-    )
-
-
-def _interpreter_version_protos(*args, **kwargs):
-    raise NotImplementedError(
-        "The protos function is only on available on Python 3.X interpreters.")
-
-
-def _interpreter_version_services(*args, **kwargs):
-    raise NotImplementedError(
-        "The services function is only on available on Python 3.X interpreters."
-    )
-
-
-def _interpreter_version_protos_and_services(*args, **kwargs):
-    raise NotImplementedError(
-        "The protos_and_services function is only on available on Python 3.X interpreters."
-    )
-
-
-if sys.version_info[0] < 3:
-    protos = _interpreter_version_protos
-    services = _interpreter_version_services
-    protos_and_services = _interpreter_version_protos_and_services
-else:
-    try:
-        import grpc_tools
-    except ImportError as e:
-        # NOTE: It's possible that we're encountering a transitive ImportError, so
-        # we check for that and re-raise if so.
-        if "grpc_tools" not in e.args[0]:
-            raise e
-        protos = _uninstalled_protos
-        services = _uninstalled_services
-        protos_and_services = _uninstalled_protos_and_services
-    else:
-        from grpc_tools.protoc import _protos as protos
-        from grpc_tools.protoc import _services as services
-        from grpc_tools.protoc import _protos_and_services as protos_and_services
 
 ###################################  __all__  #################################
 

src/python/grpcio/grpc/_runtime_protos.py

@@ -0,0 +1,68 @@
+# Copyright 2020 The gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+
+def _uninstalled_protos(*args, **kwargs):
+    raise NotImplementedError(
+        "Install the grpcio-tools package to use the protos function.")
+
+
+def _uninstalled_services(*args, **kwargs):
+    raise NotImplementedError(
+        "Install the grpcio-tools package to use the services function.")
+
+
+def _uninstalled_protos_and_services(*args, **kwargs):
+    raise NotImplementedError(
+        "Install the grpcio-tools package to use the protos_and_services function."
+    )
+
+
+def _interpreter_version_protos(*args, **kwargs):
+    raise NotImplementedError(
+        "The protos function is only on available on Python 3.X interpreters.")
+
+
+def _interpreter_version_services(*args, **kwargs):
+    raise NotImplementedError(
+        "The services function is only on available on Python 3.X interpreters."
+    )
+
+
+def _interpreter_version_protos_and_services(*args, **kwargs):
+    raise NotImplementedError(
+        "The protos_and_services function is only on available on Python 3.X interpreters."
+    )
+
+
+if sys.version_info[0] < 3:
+    protos = _interpreter_version_protos
+    services = _interpreter_version_services
+    protos_and_services = _interpreter_version_protos_and_services
+else:
+    try:
+        import grpc_tools
+    except ImportError as e:
+        # NOTE: It's possible that we're encountering a transitive ImportError, so
+        # we check for that and re-raise if so.
+        if "grpc_tools" not in e.args[0]:
+            raise e
+        protos = _uninstalled_protos
+        services = _uninstalled_services
+        protos_and_services = _uninstalled_protos_and_services
+    else:
+        from grpc_tools.protoc import _protos as protos
+        from grpc_tools.protoc import _services as services
+        from grpc_tools.protoc import _protos_and_services as protos_and_services