How Can I Merge Two Dictionaries in Python?

How to Merge Two Dictionaries in Python in a Single Expression

Python 3.9 or higher offers a straightforward syntax for merging dictionaries:

z = x | y

For Python 3.5 or later:

z = {**x, **y}

For earlier versions of Python:

def merge_two_dicts(x, y):
    z = x.copy()
    z.update(y)
    return z

Explanation:

To merge dictionaries x and y, we create a new dictionary z by:

• Copying the keys and values from x to z.
• Updating z with the keys and values from y, overwriting any existing keys from x.

The result is a new dictionary z that contains the merged values, with y's values taking precedence over x's.

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