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Logging object in python

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Understanding logger objects in Python Logging module

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[Full link ](https://docs.python.org/2/howto/logging.html#loggers)

```import logging``` to import logging module.

Hierarchy:
```logging ->handler->formatter```

Logging is User API. Handling handles the logging instance's requests to log. Also has its own level. Formatter is the final gate to writing the logs down. Helps format.

`logging.BasicConfig` to start a basic logger.

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  1. The main entry point of the application
  2.  
  3.     logger = logging.getLogger("exampleApp") #Creates the logger object
  4.     logger.setLevel(logging.INFO) #Logger level set to INFO
  5.  
  6.     # create the logging file handler
  7.     fh = logging.FileHandler("new_snake.log") #Default FileHandler created. Could have created anything else like SMTP, Stream etc.
  8.  
  9.     formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') #Formatter object for the handler.
  10.     fh.setFormatter(formatter) #Adding formatter to the Handler object
  11.  
  12.     # add handler to logger object
  13.     logger.addHandler(fh) #Adding the Handler object to the Logger
  14.  
  15.     logger.info("Program started")
  16.     result = otherMod2.add(7, 8) #To see that the inside logs differently
  17.     logger.info("Done!")
  18.  
  19.  
  20. ##For Other functions with different names
  21.  
  22. # otherMod2.py
  23. import logging
  24.  
  25. module_logger = logging.getLogger("exampleApp.otherMod2")
  26.  
  27. #----------------------------------------------------------------------
  28. def add(x, y):
  29.     """"""
  30.     logger = logging.getLogger("exampleApp.otherMod2.add")
  31.     logger.info("added %s and %s to get %s" % (x, y, x+y))
  32.     return x+y

URL: http://www.blog.pythonlibrary.org/2012/08/02/python-101-an-intro-to-logging/

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