Dictionaries

• Mapping types: have keys which map to values
• A pair of key and value is called an entry
• Dictionaries are NOT ORDERED! But they are subscriptable (with the keys - which have to be immutable objects)

phones = {'Sarah':'476-3321', 'Nathan':'351-7743'} 
users = {'Name':'Molly', 'Age':18}   
emp = {} # an empty dictionary

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You can add a new entry by just specifying it:

phones['Bob'] = '123-4567'
print(phones)

{'Sarah': '476-3321', 'Nathan': '351-7743', 'Bob': '123-4567'}

Or also change values using the keys:

phones['Sarah'] = '999-9999'
print(phones)

{'Sarah': '999-9999', 'Nathan': '351-7743', 'Bob': '123-4567'}

To delete, use:

del phones['Nathan']
print(phones)

{'Sarah': '999-9999', 'Bob': '123-4567'}