Store related data together.

Create Dictionary

```python person = { "name": "Rachel", "age": 28, "city": "Houston" } ```

Access Values

```python print(person["name"]) # Rachel print(person.get("age")) # 28

Safe access (won't error) print(person.get("email", "Not found")) # Not found ```

Modify Dictionary

```python person = {"name": "Mark", "age": 25}

Add new key person["city"] = "Dallas"

Update existing person["age"] = 26

Remove key del person["age"]

print(person) # {'name': 'Mark', 'city': 'Dallas'} ```

Loop Through Dictionary

```python person = {"name": "Lisa", "age": 30, "city": "Phoenix"}

Loop through keys for key in person: print(key)

Loop through values for value in person.values(): print(value)

Loop through both for key, value in person.items(): print(f"{key}: {value}") ```

Remember

- Use dictionaries for related data - Keys must be unique - Use get() for safe access