09-12-2015
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A Context Manager is any class that must, at least, implement a __enter__() method and a __exit__() method. The purpose of this class is to setup, or build up an object and tear it down when you are done with it.
The __enter__() method would initialize the object, it would utilized the try, except and finally statements, and it would produce a proper return.
The __exit__() method would do the proper clean up after the object is not necessary any longer.
A common example of using a Context Manager is with opening files.
If you do it manually, you would have to do the checks necessary: that the file exists, that it can be accessed and opened, etc. After that you need to release the object file by closing it. This setup and tear-down action can be taken care of, nicely, using a Context Manager.
Last edited by Aia; 09-12-2015 at 08:57 PM..
