Write a Python dict to a single file in HDFS as JSON

dict-to-json.hdfs.py

# You've got a Python dict in the driver program or shell
x = {"a":1,"b":2}

# You want to write it to a single HDFS file in JSON format
sc.parallelize([x]).toDF().coalesce(1).write.mode('append').json(/hdfs/path/...)

did you import anything to do this?

No.