Sandbox::https://github.com/feczo/pythonclass/blob/master/logged.py

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import logging

logger = logging.getLogger('add_app')

logger.setLevel(logging.DEBUG)

handler = logging.FileHandler('/tmp/add_app_error.log')

formatter = logging.Formatter(

'%(process)d %(asctime)s'

'%(pathname)s:%(lineno)d %(levelname)s %(message)s')

handler.setFormatter(formatter)

logger.addHandler(handler)

def add(a, b=0):

try:

return a+b

except TypeError:

logger.debug('different types to add ( %s %s, %s %s )' %

(a, type(a), b, type(b)))

if __name__ == '__main__':

print add(3, 4)

print add(4, 'b')