TheNeuralBit commented on code in PR #21861:
URL: https://github.com/apache/beam/pull/21861#discussion_r897340617


##########
sdks/python/scripts/generate_pydoc.sh:
##########
@@ -247,24 +247,28 @@ EOF
 
 # Build the documentation using sphinx
 # Reference: http://www.sphinx-doc.org/en/stable/man/sphinx-build.html
+# Note we cut out warnings from apache_beam.dataframe, this package uses pandas
+# documentation verbatim.
 python $(type -p sphinx-build) -v -a -E -q target/docs/source \
   target/docs/_build -c target/docs/source \
-  -w "target/docs/sphinx-build.warnings.log"
+  |& grep -E -v 'apache_beam\.dataframe.*WARNING:' \
+  |& tee "target/docs/sphinx-build.log"
 
 # Fail if there are errors or warnings in docs
-! grep -q "ERROR:" target/docs/sphinx-build.warnings.log || exit 1
-(! grep -v 'apache_beam.dataframe' target/docs/sphinx-build.warnings.log | 
grep -q "WARNING:") || exit 1

Review Comment:
   I added a comment above to explain it. The issue is that for the DataFrame 
API we copy docstrings verbatim from the equivalent pandas methods, and these 
have various issues that raise warnings in sphinx



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