Python Programming
High School (9–10)
High School (11–12)
Undergraduate
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Python Essentials › DictionariesChapter 1Storing Data: Dictionaries, Tuples and Sets
Look things up by name with dictionaries, and meet tuples and sets for data that never changes or has no repeats.
Part of Python Programming · Essentials (chapter 1)
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Dictionaries: Look Things Up
A list finds items by position. A dictionary finds them by a name. If you want the phone number of Ravi, you would like to ask for Ravi, and not for position 7. In this course you make dictionaries of keys and values, add, change and remove pairs, look things up without errors, go through a dictionary with a loop, and count with it. You learn to put a dictionary inside a dictionary, to keep a list as a value, and to group items. A tiny shop with prices, stock and a basket is the project at the end. The practice runs your code on real data and tells you which results are wrong.
Tuples and Sets
You know lists and dictionaries. Here are two more containers. A tuple is a row that cannot change, which is just right for values that belong together, such as the two numbers of a point. A set keeps every value only once, answers a yes or no question very fast, and can compare two groups: who is in both clubs, who is in only one. You build both, unpack tuples, return two values from a function, remove repeats, and use the set operations to solve small puzzles. A lesson on choosing between list, tuple, set and dictionary pulls the four together, and a school clubs project uses them all. The practice runs your code on real data and tells you which results are wrong.