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Dictionary in Python

Introduction

Python dictionary is a collection of data type and it has certain features that make it very unique. Dictionary python is somewhat similar to the real world dictionary with some key-value pairs. The purpose of using a python dictionary is that it does the optimization in order to recover the values. The two main elements of the python dictionary are; Keys & Values.

Features of Python Dictionary

1. Python dictionary is unordered that makes it possible to change the values in a dictionary.

2. It is mutable that has key-value pairs as well which is similar to maps that exist in other programming languages.

3. It has index features and since the keys are different so it is easy to use it as indexes in order to access & change the values in a dictionary.

4. Dictionary in Python has no as such duplicate members or you can say that it does not have any other replacement.

Why a dictionary is used in Python?

The following are some of the reasons why there is a dictionary in Python. 

• Since python dictionary is unordered & store the values or data like a map so it is one of the reasons that the dictionary is there in Python.

• Unlike any other data type or object in Python, the python dictionary contains the pair of key values which makes it more useful.

• The unique feature of dictionary python is that it is similar to the real world dictionary that has different types of key values in it.

Difference between Dictionary & List

• As we’ve discussed earlier dictionary Python is unordered whereas the list in Python is ordered.

• Dictionary Python has access through keys whereas the list in Python has access through indexes.

• Dictionary Python does the collection of key-value pairs and the list does the collection of keys.

• There are no duplicate members in the Python dictionary but the list in Python does have duplicate members.

• The dictionary in Python is preferred when a user has unique key values and list in Python prefers the ordered data.

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