Creating Dynamic Classes at Runtime with type()

Introduction

In Python, classes themselves are objects. This opens the door for dynamic class creation during runtime using the built-in type() function. This powerful feature is useful for metaprogramming, plugin systems, and scenarios where class definitions are generated programmatically.

Table of Contents

• Introduction

• What is type()?

• Creating a Class with type()

• Sample Code

• Use Cases

• Conclusion

What is type()?

The type() function in Python is normally used to return the type of an object. But it can also be used with three arguments to create a new class.

Syntax:

• class_name: Name of the new class as a string

• bases: Tuple of base classes (e.g., (object,))

• dict: Dictionary with methods and attributes

Creating a Class with type()

Sample Code:

Use Cases

• Dynamic ORM model creation

• Plugin systems

• Code generators

• Loading classes from config files

Conclusion

Dynamic class creation using type() allows Python developers to write more flexible and customizable code. It’s especially useful in advanced applications like frameworks, libraries, and development tools.