On Tue, Jul 10, 2012 at 11:25 AM, Mark Lawrence <breamore...@yahoo.co.uk>wrote:
> On 10/07/2012 15:58, James Bell wrote: > >> I'm attempting to learn how to use the "with....as" statement in python. >> >> I've read the documentation and also a few tutorials but I still cannot >> understand the concept. or how this is normally used. Can someone please >> write an example or 2 of simple ways to use the "with statement". >> >> I understand in java the try...catch...finally block so maybe someone can >> point out the relationship between them. >> >> thanks. >> ______________________________**_________________ >> Tutor maillist - Tutor@python.org >> To unsubscribe or change subscription options: >> http://mail.python.org/**mailman/listinfo/tutor<http://mail.python.org/mailman/listinfo/tutor> >> >> > You're not the only one, see this http://effbot.org/zone/python-** > with-statement.htm <http://effbot.org/zone/python-with-statement.htm> > > -- > Cheers. > > Mark Lawrence. > > > > ______________________________**_________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/**mailman/listinfo/tutor<http://mail.python.org/mailman/listinfo/tutor> > The 'with' statement ( http://docs.python.org/tutorial/inputoutput.html#methods-of-file-objects). 'with' is not like a try/catch/finally. It is more like a using in .NET. It's simply a way for you to create an instance of a disposable object, and have it automatically cleaned up for you at the end of the 'with' statement. Consider the following file usage: f = open('test.txt', 'r') f.read() f.close() Imagine if I forgot to close the file handler 'f'? Instead of worrying about that, you can let python handle it for you: with open('test.txt, 'r') as f: f.read() Now, when the 'with' statement ends, it will automatically dispose the file object 'f' and close the stream for you. -Mario
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