Clean Code in Python

__set__(self, instance, value)

This method is called when we try to assign something to a descriptor. It is activated with statements such as the following, in which a descriptor is an object that implements __set__ (). The instance parameter, in this case, would be client, and the value would be the "value" string:

client.descriptor = "value"

If client.descriptor doesn't implement __set__(), then "value" will override the descriptor entirely.

Be careful when assigning a value to an attribute that is a descriptor. Make sure it implements the __set__ method, and that we are not causing an undesired side effect.

By default, the most common use of this method is just to store data in an object. Nevertheless, we have seen how powerful descriptors ...