Python Dictionaries

Create an empty dictionary.

D = {}

Create a populated dictionary.

D = {'key':'value'}

>>> print D
{'key': 'value'}

Add a new item to the dictionary.

D['new key'] = 'new value'

>>> print D
{'new key': 'new value', 'key': 'value'}

Update a value

D['new key'] = 'updated value'

>>> print D
{'new key': 'updated value', 'key': 'value'}