#11 Hiding attributes&equality&mapreduce

This week features 3 topics as the title of this post suggests.

Hiding attributes:
Sometimes we run into problems by allowing modifications to attributes outside of classes. In order to prevent such problems we were introduced a method which "modifies" the property of attributes of classes. By doing so we have better control on the attributes and prevent any undesired modifications to them.
As far as I am concerned, this kind of situation have yet to concerned us since we have only been dealing with small piece of codes. However, when dealing with large piece of codes or in the situations where multiple people collaborate to generate one large piece of code, have such tools would be highly preferred.

Equality:
By definition equality means two identical objects. But in the world of programming, equality could vary by programmers self definitions. To define equality by ourselves we can rewrite the __eq__ method which allows us to self define equality.

Mapreduce:
To be discussed in detail in Post #12