You see the error message INFO:py4j.java_gateway:Received command c on object id p0 after running Python code with imported libraries.
INFO:py4j.java_gateway:Received command c on object id p0
INFO:py4j.java_gateway:Received command c on object id p0
INFO:py4j.java_gateway:Received command c on object id p0
INFO:py4j.java_gateway:Received command c on object id p0
Set the log level to ERROR after importing python libraries:
%python
import logging
logger = spark._jvm.org.apache.log4j
logging.getLogger("py4j").setLevel(logging.ERROR)
Solution found in Databricks Knowledge Base and referenced in Stackoverflow