For script tools and stand-alone scripts (scripts run outside of an ArcGIS application), you can enable or disable history logging using the SetLogHistory function.
When log history is activated, after each geoprocessing tool is run, an entry with the information about the tool will be added to the following:
When running a script, history logging is activated by default. To disable history logging, use arcpy.SetLogHistory(False).
True to enable geoprocessing logging history and False to disable.
Turn off geoprocessing log history.