udim commented on a change in pull request #12009:
URL: https://github.com/apache/beam/pull/12009#discussion_r445942319
##########
File path: sdks/python/apache_beam/typehints/typehints_test_py3.py
##########
@@ -46,11 +51,59 @@ class MyDoFn(DoFn):
def process(self, element: int) -> Iterable[str]:
pass
- print(MyDoFn().get_type_hints())
th = MyDoFn().get_type_hints()
self.assertEqual(th.input_types, ((int, ), {}))
self.assertEqual(th.output_types, ((str, ), {}))
+class TestPTransformAnnotations(unittest.TestCase):
+ def test_pep484_annotations(self):
+ class MyPTransform(PTransform):
+ def expand(self, pcoll: PCollection[int]) -> PCollection[str]:
+ return pcoll | Map(lambda num: str(num))
+
+ th = MyPTransform().get_type_hints()
+ self.assertEqual(th.input_types, ((int, ), {}))
+ self.assertEqual(th.output_types, ((str, ), {}))
+
+ def test_annotations_without_pcollection_wrapper(self):
+ class MyPTransform(PTransform):
+ def expand(self, pcoll: int) -> str:
+ return pcoll | Map(lambda num: str(num))
+
+ error_str = 'An input typehint to a PTransform must be a single (or
nested) type wrapped by a PCollection or PBegin. '
+
+ with self.assertRaisesRegex(TypeCheckError, error_str):
Review comment:
Probably because there are unescaped regex control characters in that
string: `().`
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