Instructions for updating apitools generated files.

build.gradle.kts

@@ -118,6 +118,9 @@ tasks.rat {
     // JupyterLab extensions
     "sdks/python/apache_beam/runners/interactive/extensions/apache-beam-jupyterlab-sidepanel/yarn.lock",
 
+    // Autogenerated apitools clients.
+    "sdks/python/apache_beam/runners/dataflow/internal/clients/*/**/*.py",
+
     // Sample text file for Java quickstart
     "sdks/java/maven-archetypes/examples/sample.txt",
 

sdks/python/apache_beam/runners/dataflow/internal/clients/README.txt

+To regenerate these files run
+
+pip install google-apitools[cli]
+gen_client \
+    --discovery_url dataflow.v1b3 \
+    --overwrite \
+    --root_package=. \
+    --outdir=apache_beam/runners/dataflow/internal/clients/dataflow \
+    client
+
+Patch up the imports in __init__ to make them conditional.