m-morozov-kw opened a new issue, #33189:
URL: https://github.com/apache/beam/issues/33189
### What happened?
Test env details:
Python 3.11.3
Beam SDK version: 2.60.0
Hello! We want to use generic types as a type annotation for elements in
Pardo in Python SDK to improve code readability, but it seems like Test Runner
doesn't support that. Are there any options for how we can work around that?
Please find the reproduction snippet:
Create a file like /tmp/test_pardo.py
```python
import apache_beam as beam
from typing import TypeVar, Generic
from slp_utilities import T
from apache_beam.testing.util import assert_that, equal_to
from apache_beam.testing.test_pipeline import TestPipeline
T = TypeVar("T")
class ResultContainer(Generic[T]):
def __init__(self, payload: T) -> None:
self.payload = payload
class SomeDoFn(beam.DoFn):
def process(self, data: ResultContainer[int]):
yield data.payload + 1
def test_pardo():
with TestPipeline() as p:
output = p | beam.Create([ResultContainer(1)]) |
beam.ParDo(SomeDoFn())
assert_that(
label="check result",
actual=output,
matcher=equal_to([2]),
)
```
Run it as a test
```sh
pytest /tmp/test_pardo.py
```
Expected: test passes
Actual behavior:
```sh
def __subclasscheck__(self, cls):
> raise TypeError("Subscripted generics cannot be used with"
" class and instance checks")
E TypeError: Subscripted generics cannot be used with class and
instance checks
```
Thank you
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [X] Component: Python SDK
- [ ] Component: Java SDK
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- [ ] Component: Infrastructure
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