Can one of the admins verify this patch?

I'm fine with it. This is not mandatory but it's suggestion from pep8.

[1] https://peps.python.org/pep-0008/#function-and-method-arguments

# grep -R "@classmethod" **/*.py -A2 | grep self
python/pyspark/mllib/clustering.py-        self,
python/pyspark/testing/sqlutils.py-    def sqlType(self):
python/pyspark/testing/sqlutils.py-    def sqlType(self):

Then, let's also fix other style error together.

Are there any other cases?

Thank you @Yikun
What tool are you using?

@srowen Not that I can find.

I'm using sonarqube but I can't search after only this one thing.

@bjornjorgensen No tool in here, just a script as I mentioned in last comment: grep -R "@classmethod" **/*.py -A2 | grep self

Merged to master