PySpark: spit out single file when writing instead of multiple part files

Is there a way to prevent PySpark from creating several small files when writing a DataFrame to JSON file?

If I run:

 df.write.format('json').save('myfile.json')

or

df1.write.json('myfile.json')

it creates the folder named myfile and within it I find several small files named part-***, the HDFS way. Is it by any means possible to have it spit out a single file instead?