How to access SparkContext from SparkSession instance?

Asumming you have a spark session

spark_session = SparkSession \
    .builder \
    .enableHiveSupport() \
    .getOrCreate()

---

Spark Context can be inferred using

spark_context = spark_session._sc

or

spark_context = spark_session.sparkContext

You almost got it right, it's lowercase s at the beginning:

>>> spark.sparkContext
<SparkContext master=local[*] appName=PySparkShell>