How to Append a Dictionary to a List in Python

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by Abdul Rawoof A R dot icon Updated: Feb 1, 2023

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By first getting the list using the key and then adding an element to the list using the "append()" function, you may append to a list that is a value in a dictionary in Python. 

  • append(): In Python, an element is added to the end of a list using the append() function. It does not produce a new list but rather alters the existing list. It just requires a single parameter, the element to be added, and updates the list in place. 

You can also use the “setdefault()” method to append to a list value in a dictionary if the key does not exist. 

  • setdefault(): The setdefault() method is a built-in method of dictionaries in Python that is used to insert a key-value pair into a dictionary if the key is not already present. 

You can also use “defaultdict” from the collections library. 

  • defaultdict: defaultdict is a class in the collections module in Python that is used to create a dictionary with a default value for keys that do not exist. It creates a dictionary-like object that returns a default value when a non-existent key is accessed.  

Please review the code below to learn how to append values to a list in a dictionary in Python. 

Fig : Preview of the output that you will get on running this code from your IDE.



Follow the steps carefully to get the output easily.

  1. Install python on your IDE(Any of your favorite IDE).
  2. Copy the snippet using the 'copy' and paste it in your IDE.
  3. Run the file to generate the output.

I hope you found this useful.

I found this code snippet by searching for 'Appending to a list in a dictionary in python' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in PyCharm 2021.3.
  2. The solution is tested on Python 3.9.7.

Using this solution, we are able to appending to a list in a dictionary in python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to appending to a list in a dictionary in python.


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