Can you give an example of a class definition in Python?

Example of defining a class in Python:

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def greet(self):
        return f"Hello, my name is {self.name} and I am {self.age} years old."

# Using the class
p = Person("Ivan", 30)
print(p.greet())

In this example, the Person class has a constructor __init__, which initializes the name and age, as well as a greet method that returns a greeting message.