Dictionaries & Sets

While lists are indexed by numbers, Dictionaries are indexed by Keys. Sets are unordered collections of unique elements.

1. Dictionaries (dict)

Equivalent to Objects in JS or HashMaps in Java.

user = {
    "name": "Pradeep",
    "age": 25,
    "email": "pradeep@example.com"
}

print(user["name"]) # Pradeep
user["age"] = 26     # Update

2. Sets (set)

Sets automatically remove duplicates and are great for membership testing.

colors = {"red", "green", "blue", "red"}
print(colors) # {"red", "green", "blue"}

# Checking membership (Fast!)
if "blue" in colors:
    print("Found it!")

3. Set Operations

Python sets support mathematical operations like union and intersection.

group_a = {1, 2, 3}
group_b = {3, 4, 5}

print(group_a | group_b) # Union: {1, 2, 3, 4, 5}
print(group_a & group_b) # Intersection: {3}