overwriting a spark output using pyspark

[Devesh Raj Singh]

I am trying to overwrite a spark dataframe using the following option but I
am not successful

spark_df.write.format('com.databricks.spark.csv').option("header",
"true",mode='overwrite').save(self.output_file_path)

the mode=overwrite command is not successful
-- 
Warm regards,
Devesh.