Dictionaries
Learn all about the Python dictionary structure and how to create and use key-value pairs in your code.
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Key Concepts
Review core concepts you need to learn to master this subject
Python dictionaries
Syntax of the Python dictionary
Dictionary value types
Accessing and writing data in a Python dictionary
Merging Dictionaries with the .update() Method in Python
get() Method for Dictionary
The .pop() Method for Dictionaries in Python
Dictionary accession methods
Python dictionaries
Python dictionaries
my_dictionary = {1: "L.A. Lakers", 2: "Houston Rockets"}A python dictionary is an unordered collection of items. It contains data as a set of key: value pairs.
Creating Dictionaries
Lesson 1 of 2
- 1A dictionary is an unordered set of key: value pairs. It provides us with a way to map pieces of data to each other so that we can quickly find values that are associated with one another. Sup…
- 2In the previous exercise, we saw a dictionary that maps strings to numbers (i.e., “avocado toast”: 6). However, the keys can be numbers as well. For example, if we were mapping restaurant bill su…
- 3We can have a list or a dictionary as a value of an item in a dictionary, but we cannot use these data types as keys of the dictionary. If we try to, we will get a TypeError. For example: powe…
- 4A dictionary doesn’t have to contain anything. Sometimes we need to create an empty dictionary when we plan to fill it later based on some other input. We can create an empty dictionary like this:…
- 6If we wanted to add multiple key : value pairs to a dictionary at once, we can use the .update() method. Looking at our sensors object from a previous exercise: sensors = {“living room”: 21, “kit…
- 7We know that we can add a key by using syntax like: menu[“avocado toast”] = 7 This will create a key “avocado toast” and set the value to 7. But what if we already have an ‘avocado toast’ entry …
- 8Let’s say we have two lists that we want to combine into a dictionary, like a list of students and a list of their heights, in inches: names = [‘Jenny’, ‘Alexus’, ‘Sam’, ‘Grace’] heights = [61, 70…
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