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Fix NameError when pydot is not installed in Beam Playground #38074

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Merged
liferoad merged 1 commit into from
Apr 8, 2026
+6 −0
Merged

Fix NameError when pydot is not installed in Beam Playground #38074

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6 changes: 6 additions & 0 deletions sdks/python/apache_beam/runners/interactive/display/pipeline_graph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -237,6 +237,12 @@ def _construct_graph(
default_edge_attrs: (Dict[str, str]) a dict of attributes
"""
with self._lock:
try:
pydot.Dot()
except NameError:
raise RuntimeError(
'pydot is required for pipeline graph generation. '
'Install it with: pip install pydot')
self._graph = pydot.Dot()

if default_vertex_attrs:
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