damccorm commented on code in PR #24526:
URL: https://github.com/apache/beam/pull/24526#discussion_r1041157517


##########
sdks/python/apache_beam/transforms/combiners.py:
##########
@@ -517,7 +517,6 @@ def merge_accumulators(self, accumulators, *args, **kwargs):
               (holds_comparables, result_heap),
               comparable.value if holds_comparables else comparable)
 
-    assert result_heap is not None and holds_comparables is not None

Review Comment:
   Not sure I follow why we need the changes beyond `.pre-commit-config.yaml` - 
is there a reason we need to change `combiners.py` and `core.py`



##########
.pre-commit-config.yaml:
##########
@@ -11,7 +11,7 @@
 # limitations under the License.
 
 default_language_version:
-  python: python3.7
+  python: python3

Review Comment:
   It looks like `default_language_version` is optional - can we just remove 
it? https://pre-commit.com/#top_level-default_language_version



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