A dictionary stores key–value pairs.

Example:

d = {"name": "Tanu", "age": 20, "city": "Delhi"}

1. Keys must be unique
2. Keys must be immutable (str, int, tuple)
3. Values can be any data type and can repeat
4. Dictionary is unordered (in Python 3.7+ it maintains insertion order)

d = {"name": "Tanu", "age": 20}
print(d["name"])

Output: Tanu

d["city"] = "Kolkata"

d["age"] = 21

Using del

del d["age"]

Using pop()

d.pop("city")

Using popitem() (removes last inserted item)

d.popitem()

len({"a":1, "b":2})

Output: 2

Converts dictionary to string.

d = {"a":1, "b":2}
print(d.keys())

Output: dict_keys(['a', 'b'])

print(d.values())

print(d.items())

d.get("age")

d.update({"city": "Delhi"})