Program 1
Create & access dict
Basic dictionary operations.
python
student = {"name": "Riya", "age": 21, "grade": "A"}
print(student["name"])
student["age"] = 22
student["city"] = "Mumbai"
print(student) All topicsBasic Intermediate Intermediate Advanced
Topic 08 of 17
Dictionaries
Key-value mappings — fast lookups and structured data.
get/setdefault
Dict comprehensions
Merging (|)
Iteration
Basic
2 programsBasic
Program 2
Iterate items
Walk keys and values together.
python
prices = {"apple": 30, "banana": 10, "mango": 50}
for item, price in prices.items():
print(f"{item}: ₹{price}")Intermediate
2 programsProgram 1
Dict comprehension
Build a dict in a single expression.
python
squares = {x: x * x for x in range(1, 6)}
print(squares)Program 2
Merge dictionaries
Use the | operator (Python 3.9+).
python
a = {"x": 1, "y": 2}
b = {"y": 20, "z": 3}
print(a | b)Advanced
1 programProgram 1
Group by key
Group items using defaultdict.
python
from collections import defaultdict
people = [("dev", "Asha"), ("design", "Ravi"), ("dev", "Maya"), ("design", "Sam")]
teams = defaultdict(list)
for team, name in people:
teams[team].append(name)
print(dict(teams))