code: def getConf(self, key, defaultValue=_NoValue):
          
          return self.sparkSession.conf.get(key, defaultValue)
docs: Returns the value of Spark SQL configuration property for the given key.
  
          If the key is not set and defaultValue is set, return
          defaultValue. If the key is not set and defaultValue is not set, return
          the system default value.
  
          >>> sqlContext.getConf("spark.sql.shuffle.partitions")
          u'200'
          >>> sqlContext.getConf("spark.sql.shuffle.partitions", u"10")
          u'10'
          >>> sqlContext.setConf("spark.sql.shuffle.partitions", u"50")
          >>> sqlContext.getConf("spark.sql.shuffle.partitions", u"10")
          u'50'