Learn Web Development with Python

Data classes

Before we leave the OOP realm, there is one last thing I want to mention: data classes. Introduced in Python 3.7 by PEP557 (https://www.python.org/dev/peps/pep-0557/), they can be described as mutable named tuples with defaults. Let's dive into an example:

# oop/dataclass.pyfrom dataclasses import dataclass@dataclassclass Body:    '''Class to represent a physical body.'''    name: str    mass: float = 0.  # Kg    speed: float = 1.  # m/s    def kinetic_energy(self) -> float:        return (self.mass * self.speed ** 2) / 2body = Body('Ball', 19, 3.1415)print(body.kinetic_energy())  # 93.755711375 Jouleprint(body)  # Body(name='Ball', mass=19, speed=3.1415)

In the previous code, I have created a class to represent a physical body, with one method that allows ...