one problem with the logging module when used in a repl environment like pythonista is that when you rerun a script, it creates a new logger instance... so you need to have some extra logic.
here is the little cookbook that i use in pythonista:
import logging, sys
logger = logging.getLogger('myapp')
if not logger.handlers:
filehdlr = logging.FileHandler('myapp.txt','w')
strmhandler = logging.StreamHandler(sys.stdout)
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
filehdlr.setFormatter(formatter)
strmhandler.setFormatter(formatter)
logger.addHandler(filehdlr)
logger.addHandler(strmhandler)
filehdlr.setLevel(logging.DEBUG)
strmhandler.setLevel(logging.INFO)
logger.setLevel(logging.DEBUG)
% examples
logger.debug('this gets logged to file only')
logger.info('this shows to screen and file')