pyspark AttributeError: 'DataFrame' object has no attribute 'toDF'

Question

The following code worked for me before, but not anymore. I got the error:

AttributeError: 'DataFrame' object has no attribute 'toDF'

if __name__ == "__main__":
  sc = SparkContext(appName="test")
  sqlContext = SQLContext(sc)

  df = sqlContext.read.format('com.databricks.spark.csv').\
    options(header='false',delimiter=',',inferSchema='true').load('test')

  ### rename columns
  df = df.toDF('a','b','c')
  ...
  sc.stop()

Answer 1

I figured it out. Looks like it has to do with our spark version. It worked with 1.6