In the Spark context try using:
SparkContext.addPyFile("module.py") # Also supports .zip
Quoting from the docs:
Add a .py or .zip dependency for all tasks to be executed on this
SparkContext in the future. The path passed can be either a local
file, a file in HDFS (or other Hadoop-supported filesystems), or an
HTTP, HTTPS or FTP URI.