Python Dictionary | How to use Dictionaries in python

Python Dictionaries Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and do not allow duplicates. As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered.Dictionaries are written with curly brackets, and have keys and values

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Python Dictionary In this tutorial, you'll learn everything about Python dictionaries; how they are created, accessing, adding, removing elements from them and various built-in methods. Python dictionary is an unordered collection of items. Each item of a dictionary has a key/value pair. Dictionaries are optimized to retrieve values when the key is known. Creating Python Dictionary Creating a dictionary is as simple as placing items inside curly braces {} separated by commas. An item has a key and a corresponding value that is expressed as a pair (key: value). While the values can be of any data type and can repeat, keys must be of immutable type (string, number or tuple with immutable elements) and must be unique.

Python Dictionary Dictionary in Python is an unordered collection of data values, used to store data values like a map, which, unlike other Data Types that hold only a single value as an element, Dictionary holds key:value pair. Key-value is provided in the dictionary to make it more optimized.

Dictionaries in Python Defining a Dictionary Accessing Dictionary Values Dictionary Keys vs. List Indices Building a Dictionary Incrementally Restrictions on Dictionary Keys Restrictions on Dictionary Values Operators and Built-in Functions Built-in Dictionary Methods Python provides another composite data type called a dictionary, which is similar to a list in that it is a collection of objects.

Here’s what you’ll learn in this tutorial: You’ll cover the basic characteristics of Python dictionaries and learn how to access and manage dictionary data. Once you have finished this tutorial, you should have a good sense of when a dictionary is the appropriate data type to use, and how to do so. Dictionaries and lists share the following characteristics: Both are mutable. Both are dynamic. They can grow and shrink as needed. Both can be nested. A list can contain another list. A dictionary can contain another dictionary. A dictionary can also contain a list, and vice versa.

Python - Dictionary Each key is separated from its value by a colon (:), the items are separated by commas, and the whole thing is enclosed in curly braces. An empty dictionary without any items is written with just two curly braces, like this: {}. Keys are unique within a dictionary while values may not be. The values of a dictionary can be of any type, but the keys must be of an immutable data type such as strings, numbers, or tuples. Accessing Values in Dictionary To access dictionary elements, you can use the familiar square brackets along with the key to obtain its value.

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