zero323 commented on a change in pull request #29591:
URL: https://github.com/apache/spark/pull/29591#discussion_r484184260
##########
File path: examples/src/main/python/ml/estimator_transformer_param_example.py
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@@ -54,7 +56,7 @@
print(model1.extractParamMap())
# We may alternatively specify parameters using a Python dictionary as a
paramMap
- paramMap = {lr.maxIter: 20}
+ paramMap: Dict[Param, Any] = {lr.maxIter: 20}
Review comment:
It is. In such cases Mypy infers the type of `paramMap` to be
`Dict[Param, int]` and will fail on subsequent update:
```python
paramMap.update({lr.regParam: 0.1, lr.threshold: 0.55})
```
In general I'd prefer to keep tests against examples as these are the
biggest chunks of "real-life" code (short of docstrings, but these create way
more issues) that we have and nicely highlight many possible problems.
In `pyspark-stubs` I simply clone the repo and [patch
examples](https://github.com/zero323/pyspark-stubs/blob/faad51cfd4b8971cda889f79c6857dd28ad62078/.travis.yml#L11-L12)
before tests.
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