Dictionary

Mutable of object of key-value pairs.

Keys must be immutable so they can be hashed. e.g. str, int, tuple. Not a list or dict.

Related

• dict in the Python docs.
• dictionary type checks for how to annotate your dict and validate usage with type checking.

Create

{"a": 1, "b": 2}

dict(a=1, b=2)

Get

x['abc']

Implies returning None if key does not exist.

x.get('abc')
# None

x.get('abc', 0)
# 0

Set

x.update('abc', 1)

x['abc'] = 1

Delete

del x['abc']

Iterate

x.keys()

x.values()

x.items()