saavan-google-intern commented on a change in pull request #12009:
URL: https://github.com/apache/beam/pull/12009#discussion_r445877050
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File path: sdks/python/apache_beam/typehints/decorators.py
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@@ -378,6 +379,61 @@ def has_simple_output_type(self):
self.output_types and len(self.output_types[0]) == 1 and
not self.output_types[1])
+ def strip_pcoll_input(self):
+ # type: () -> IOTypeHints
+
+ error_str = 'An input typehint to a PTransform must be a single (or
nested) type wrapped by a PCollection or ' \
+ 'PBegin. '
+
+ if any(element is None for element in [self.input_types,
self.input_types[0], self.input_types[0][0]]):
Review comment:
Now that I think about it this can be a simple try/catch IndexError
instead of manually checking for None
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