Dictionary - Advanced Python

A dictionary is a collection which is unordered, changeable and indexed. A dictionary consists of a collection of key-value pairs. Each key-value pair maps the key to its associated value. A dictionary is written in braces. Each key is separated from its value by a colon (:) and the items are separated by commas.

my_dict = {"name":"Max", "age":28, "city":"New York"}

Create a dictionary

Create a dictionary with braces, or with the built-in dict function.

Access items

Add and change items

Simply add or access a key and assign the value.

Delete items

Check for keys

Looping through dictionary

Copy a dictionary

Be careful when copying references.

Merge two dictionaries

Possible key types

Any immutable type, like strings or numbers can be used as a key. Also, a tuple can be used if it contains only immutable elements.

Nested dictionaries

The values can also be container types (e.g. lists, tuples, dictionaries).