How to Iterate Through a Dictionary in Python? (With Examples)

In Python, iterating over a dictionary is a crucial skill for developers to be able to access and manipulate key-value pairs efficiently. It allows them to perform different operations, including updating information, extracting values, and applying a particular logic to every key-value pair. 

Moreover, developers must know how to iterate over a dictionary in Python to handle and process data while interacting effectively with the contents of a dictionary. This blog discusses different ways to iterate through a dictionary in Python, explaining each method with an example. 

Python Dictionaries

Dictionaries are useful data structures in Python that store items in key-value pairs. Keys on dictionaries are hashable, so their values can’t be changed. Also, there can’t be duplicate keys in a dictionary. We can access values stored in a dictionary using keys. Many aspects of Python are built around dictionaries. Classes, modules, objects, locals(), and globals() show how deeply dictionaries are wired into the implementation of Python. 

The keys in a dictionary are like a set. They are hashable (so we can’t use mutable objects as keys) and unique objects. Values in a dictionary can be of any data type, be it hashable or non-hashable. 

Key points to remember about Python dictionaries

• Dictionaries store items in key-value pairs. They map keys to values and store them in a collection.
• Dictionaries are indexed by keys, so we can access values stored in them using their associated keys.
• Keys in dictionaries are hashable, so they must have a hash value that can never change during a key’s lifetime. 

Also read: 10+ Best Python Books For Beginners and Experts

How to Iterate Over a Dictionary in Python

Iterating through a dictionary refers to going through each key-value pair one by one, accessing a dictionary, and traversing every key-value present. It is crucial to use a Python dictionary properly. In Python, iterating over a dictionary is possible through various ways that we have discussed below:

1. Iterate through Python dictionary using build.keys()
2. Iterate key-value pair using items()
3. Iterate through all values using .values()
4. Looping through a dictionary using for loop
5. Access a key in Python using zip()
6. Access key using map() and dict.get
7. Access key Using Unpacking of dictionary