Python Programming Language: How to Loop Through Dictionaries

Hi everyone, welcome back. In these examples, we will be going over how to loop through dictionaries in Python. Dictionaries can be used to store a collection of data. Dictionaries use key-value pairs to store data compared to using index numbers. Dictionaries are mutable and does not allow for duplicate keys. For Python 3.7 and higher, dictionaries are ordered whereas in earlier versions, dictionaries are unordered. With this introduction out of the way, let’s get into it.

Creating Dictionary

Let’s start by creating our dictionary:

myDictionary = {
    "first": "A",
    "second": "B",
    "third": "C",
}
print(myDictionary)
Output:
{'first': 'A', 'second': 'B', 'third': 'C'}

So now, we have a populated dictionary with a few elements. We can verify that it was successfully created and populated by printing the dictionary and checking the output. Now let’s see how we can loop through the dictionary.

Looping Through Dictionary Keys

Let’s start by seeing how we can loop through the dictionary keys. We can retrieve all the keys within a dictionary by using the built in keys() function that is provided. Let’s see an example: