Question

If we want to make a method that is added dynamically to a class available to all the instances of the class, how can it be done? Explain with an example.

Answer 1

Assign the function to the class, not to a particular object. Then every existing and future instance can use that method.

class HealthProfile:
    def __init__(self, name):
        self.name = name


# Function defined outside the class
def play(self):
    print(self.name, "is playing")


# Add the function dynamically to the class
HealthProfile.play = play

h1 = HealthProfile("Shalini")
h2 = HealthProfile("Ritu")
h1.play()
h2.play()
Shalini is playing
Ritu is playing

Note: Use HealthProfile.play = play, not HealthProfile.play = play(). Writing play() would call the function immediately instead of attaching it as a method.