code: def sql_context(self, application_name):
          
          sc = self.spark_context(application_name)
          import pyspark
          sqlContext = pyspark.SQLContext(sc)
          return (sc, sqlContext)
docs: Create a spark context given the parameters configured in this class.
  
          The caller is responsible for calling ``.close`` on the resulting spark context
  
          Parameters
          ----------
          application_name : string
  
          Returns
          -------
          sc : SparkContext