[GitHub] [spark] HyukjinKwon commented on a diff in pull request #37117: [SPARK-39714][PYTHON] Try to fix the mypy annotation tests

[GitBox <gi...@apache.org>]

HyukjinKwon commented on code in PR #37117:
URL: https://github.com/apache/spark/pull/37117#discussion_r918728918


##########
python/pyspark/ml/util.py:
##########
@@ -536,10 +536,8 @@ def __get_class(clazz: str) -> Type[RL]:
         """
         parts = clazz.split(".")
         module = ".".join(parts[:-1])
-        m = __import__(module)
-        for comp in parts[1:]:
-            m = getattr(m, comp)
-        return m
+        m = __import__(module, fromlist=[parts[-1]])
+        return getattr(m, parts[-1])

Review Comment:
   Hm, I think this changes the semantic. Previously, it returned the left-most import but not it returns right-most package. For example,
   
   ```python
   >>> __import__("pyspark", fromlist=['sql'])
   <module 'pyspark' from '/.../spark/python/pyspark/__init__.py'>
   >>> m = __import__("pyspark")
   >>> getattr(m, "sql")
   <module 'pyspark.sql' from '/.../spark/python/pyspark/sql/__init__.py'>
   ```



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