Dictionaries in Python are mutable, which means new key–value pairs can be added at any time.


1. Add new key - value :

Python 
student = { "name": "Rahul", "age": 21 } student["course"] = "B.Tech" print(student) #output {'name': 'Rahul', 'age': 21, 'course': 'B.Tech'}


2. Add multiple Items :

Python 
student = { "name": "Rahul", "age": 21 } student.update({ "city": "Chennai", "grade": "A" }) print(student) #output {'name': 'Rahul', 'age': 21, 'course': 'B.Tech', 'city': 'Chennai', 'grade': 'A'}