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Python Dictionaries

Dictionaries store data as key-value pairs. They're perfect for representing structured data like a person's profile or settings.

python

person = {
    "name": "Alice",
    "age": 30,
    "city": "NYC"
}

print(person["name"])     # Alice
print(person.get("age"))  # 30

Modifying Dictionaries

You can add, update, and remove key-value pairs easily.

python

person = {"name": "Alice", "age": 30}

person["email"] = "alice@example.com"  # Add new key
person["age"] = 31                     # Update value
del person["age"]                      # Delete key

print(person)

Looping Through Dictionaries

You can iterate over keys, values, or both using dictionary methods.

python

scores = {"math": 95, "science": 87, "english": 92}

for subject, score in scores.items():
    print(f"{subject}: {score}")

Tip:Dictionary keys must be immutable (strings, numbers, tuples). Values can be anything — even other dictionaries!