Append Dictionary Keys and Values (In order) in Dictionary - Python

Given two lists one containing dictionary keys and the other containing corresponding values create a dictionary that preserves the order of keys as they appear. For Example:

Input: keys = ["name", "age", "city"], values = ["Harry", 30, "New York"]
Output: {'name': 'Harry', 'age': 30, 'city': 'New York'}

Below are methods to create an ordered dictionary:

Using zip and Dictionary Constructor

This method pairs keys and values using zip and converts them into a dictionary in a single step.

{'name': 'Robin', 'age': 30, 'city': 'New York'}

Explanation:

• zip(keys, values): Pairs keys with their corresponding values.
• dict(): Creates the dictionary in insertion order.

Using for Loop with Direct Assignment

This method involves manually iterating over the keys and values to append them in order.

{'name': 'Robin', 'age': 30, 'city': 'New York'}

Explanation:

• zip(keys, values): Combines keys and values for iteration.
• Each key-value pair is appended to the dictionary using assignment.

Using update() with Dictionary Comprehension

This method uses a dictionary comprehension to create key-value pairs and appends them to an existing dictionary using the update method.

{'name': 'Robin', 'age': 30, 'city': 'New York'}

Explanation:

• {k: v for k, v in zip(keys, values)}: Generates a dictionary from paired keys and values.
• d.update(...): Adds all pairs to dictionary d.

Using OrderedDict from collections

This method uses OrderedDict to create a dictionary that preserves the insertion order of keys, which is especially useful for Python versions earlier than 3.7.

OrderedDict({'name': 'Robin', 'age': 30, 'city': 'New York'})

Explanation: OrderedDict(zip(keys, values)) creates an ordered dictionary preserving the order of keys.

Related Articles:

• Append a Value to a Dictionary
• OrderedDict