Python Round Function Issues with pyspark

Import import pyspark.sql.functions as F to avoid conflict.

In this way, you can use all python built-in functions normally and when you want to use pyspark functions, use them as F.round

Don't do import * as it can mess up your namespace.

Pyspark has round function: http://spark.apache.org/docs/2.1.0/api/python/pyspark.sql.html#pyspark.sql.functions.round

So build-in function round is being replaced by pyspark.sql.functions.round