Dictionaries in Python

Madison

A dictionary lists key-value pairs, which could also be thought of as associated values where a key matches to the associated value. Let’s look at a few examples.

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# Dictionary - mapping between values
house = {'bedrooms': 3, 'bathrooms': 2, 
         'city': 'Kelowna', 'price': 250000}

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house['price']

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## 250000

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course = {'Data Science': ['DATA100', 'DATA200', 'DATA300'],
            'Science': ['SCIENCE100', 'SCIENCE200', 'SCIENCE300']}

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course['Data Science']

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## ['DATA100', 'DATA200', 'DATA300']

What if we wanted to turn the following information into a dictionary.

Name	ID	Campus	Courses
Dan	12345678	Okanagan	DATA100, ENGL100, HIST100, CHEM100

This is how we would do this:

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student = {'Name' : 'Dan',
            'ID' : 12345678,
            'Campus' : 'Okanagan',
            'Courses': ['DATA100', 'ENGL100', 'HIST100', 'CHEM100']}
student

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## {'Name': 'Dan', 'ID': 12345678, 'Campus': 'Okanagan', 'Courses': ['DATA100', 'ENGL100', 'HIST100', 'CHEM100']}