How to print instances of a class using print()?

To print instances of a class using the built-in print() function, you can define a __str__ method within the class. The __str__ method should return a string representation of the object, which will be printed when the print() function is called on an instance of the class. Here's an example of a simple class with a __str__ method:

class MyClass:
    def __init__(self, value):
        self.value = value

    def __str__(self):
        return str(self.value)

obj = MyClass(10)
print(obj) # will print "10"

Watch a video course Python - The Practical Guide

In this example, the MyClass class has a single attribute value and a __str__ method that returns the string representation of value. When an instance of MyClass is created and passed to the print() function, the __str__ method is called and its return value is printed.

Note that str is used for user-friendly representation, if you need something more machine-readable, you should use repr method.