Find more information visit [http://docs.python.org/install/index.html](http://docs.python.org/install/index.html).

```Dataclasses``` are python classes but are suitedfor storing data objects.

This module provides a decoratorand functionsfor automatically adding generated special methods suchas```__init__()```and```__repr__()``` to user-defined classes.

1. They store dataand represent a certain datatype. Ex: A number. For people familiarwith ORMs, a model instanceis a dataobject. It represents a specific kind of entity. It holds attributes that defineor represent the entity.

2. They can be compared to other objects of the sametype. Ex: A number can be greater than, less than,or equal to another number.

Python3.7 provides a decorator dataclass thatis used to convert aclass into a dataclass.

python2.7

>>>class Number:

...def__init__(self, val):

...self.val= val

>>>obj= Number(2)

>>> obj.val

with dataclass

>>>@dataclass

...class Number:

... val:int

>>>obj= Number(2)

>>> obj.val

The use of a Virtual Environmentis to test python codein encapsulated environmentsand to also avoid filling the base Python installationwith libraries we might usefor only one project.