Dynamic Classes

Custom metaclasses can modify classes by performing further actions or adding code. Usually, we do not require custom metaclasses, but sometimes they are necessary.

Dynamic creation of a class

In the previous lesson, we examined the types of different objects by passing a single argument to the type() function. That’s certainly not the end; this function can do much more. We can also create the classes using the type() function. Isn’t this amazing?

We can also call type() with three arguments:

type(<name>, <base>, <dct>)

• The <name> is the name of the class. If passed, it becomes the __name__ attribute of the class.
• The <base> is the tuple of the base classes from which the class inherits. If passed, it becomes the __base__ attribute of the class.
• The <dct> is the local namespace of the class containing the definitions for the class body, which includes class methods and variables. If passed, it becomes the __dict__ attribute of the class.

Creating classes with type()

Without any further ado, let’s start creating dynamic classes by using different variations of type().

Variation I

Take the example of the following class:

class A:
  pass

Now let’s create the same class dynamically.