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DataHub

I am trying to make some change in a branch. I was running these commands <https://datahubproject.io/docs/metadata-ingestion/developing#testing>
```metadata-ingestion ❯ mypy .

setup.py: error: Duplicate module named "setup" (also at "./examples/transforms/setup.py")
setup.py: note: Are you missing an __init__.py? Alternatively, consider using --exclude to avoid checking one of them.
Found 1 error in 1 file (errors prevented further checking)```
Are these commands out of date? Is there a way to filter this folder out?

Similar problem with
```metadata-ingestion ❯ flake8 .

./examples/transforms/custom_transform_example.py:9:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:10:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:12:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:13:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:14:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:15:1: E402 module level import not at top of file
./examples/transforms/custom_transform_example.py:16:1: E402 module level import not at top of file```


Tests on github seem to be different than what is in the guide <https://github.com/linkedin/datahub/pull/3035#issuecomment-893320703>

<@U027B7R23J4> I usually just run the gradle equivalents.
```../gradlew :metadata-ingestion:lintFix```
etc.

Yep – looks like there’s some inconsistencies between this guide and what we run in gradle (typically only the `src/` and `test/` directories). I’ll update the docs!

What is the difference between
<https://github.com/linkedin/datahub/tree/master/metadata-ingestion/examples>
and <https://github.com/linkedin/datahub/tree/master/metadata-ingestion-examples>
The first one is causing errors in <https://datahubproject.io/docs/metadata-ingestion/developing#sanity-check-code-before-committing>
```flake8 .
mypy .```
