python-OBD uses python's builtin logging system. By default, it is setup to send output to stderr with a level of WARNING. The module's logger can be accessed via the logger variable at the root of the module. For instance, to enable console printing of all debug messages, use the following snippet:

import obd

obd.logger.setLevel(obd.logging.DEBUG) # enables all debug information

Or, to silence all logging output from python-OBD:

import obd