Hi,

I hope there are people here with strong OOP experience.

Which classes would an object-oriented python programmer create for the design 
of a e-book reader for example? I am not really interested in the code, just 
the OOP classes that would come to one's mind for a task like this.

It should allow users to buy new e-books, view their list of purchased books 
and read the books.

I have made an attempt of class diagram here "http://imgur.com/9TR2Tlm"; but I 
would be really glad to hear other opinions. I have not used any inheritance 
for example. I didn't know exactly where it would be handy and I also dont know 
if these classes are theoretically a good basis at all...

Thanks a lot for comments/feedback.
Felix



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