#Merging two dictionaries python how to

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the operators are new features in Python 3.9.

the update operator, |=, operates in-place, catches common errors before they happen and it doesn't create a new object.

the merge operator, |, is class aware, offers a better syntax and it creates a new object.

The new operators are not here to replace the existing ways of merging and updating,īut rather to complement them. TypeError: unsupported operand type(s) for |=: 'dict' and 'dict' The dictionary update operator |= and the merge operator | are new features in Python 3.9, so if you are trying to use them in an earlier version you will encounter an error similar to this, so make sure you update to the latest version: Traceback (most recent call last): Let's start by diving into a short example demonstrating the old way of merging two dictionaries: x = īesides the better syntax that the new dictionary update operator |= has to offer, another advantage of using it is a safer dictionary update by throwing a Synta圎rror instead of None when using it inside print.

#Merging two dictionaries python how to

Given two or more dictionaries, we fuse them into a single one. In this tutorial, we are going to learn how to combine two dictionaries in Python.Lets see some ways to merge two dictionaries. In this blog post we will go over the new operators to see if there are any advantages or disadvantages of using them over the earlier ways of merging and updating dictionaries.

5, 2020 and it introduces some neat features and optimizations including PEP 584, Union Operators in the built-in class dict the so-called Dictionary Merge and Update Operators.