So, if you need a quick and easy way to store and find data, dictionaries are your best friend!<\/p>\n
Creating a dictionary in Python is easy peasy! Just wrap your elements inside curly braces {}, and separate them with commas. Here are some examples to show you how it’s done.<\/p>\n
In this example, we start with an empty dictionary called D. Then, we take elements from a Python list called L and put them into the dictionary. Each sublist in L has two elements: the first one becomes the key, and the second one becomes the value. We do this dynamically, meaning we add key-value pairs as needed.<\/p>\n
<\/div>\n
\r\n# Declare an empty dictionary\r\nD = {}\r\n# Python list with sublists containing key-value pairs\r\nL = [['a', 1], ['b', 2], ['c', 3]]\r\n# Add elements from the list into the dictionary dynamically\r\nfor sublist in L:\r\nkey = sublist[0]\r\nvalue = sublist[1]\r\nD[key] = value\r\n# Print the resulting dictionary\r\nprint(D)<\/code><\/pre>\n<\/div>\n
Output:<\/strong><\/p>\n{‘a’: 1, ‘b’: 2, ‘c’: 3}<\/p>\n
Understanding Keys and Values in Dictionaries<\/h2>\n
In this demonstration, we’ll expand the existing Python dictionary by adding another element. We’ll be given both the key and the value separately, and we’ll insert this pair into the dictionary called my_dict.<\/p>\n
Example<\/strong><\/p>\n<\/div>\n
\r\n# Existing dictionary\r\nmy_dict = {'a': 1, 'b': 2, 'c': 3}\r\n# New key and value to be added\r\nnew_key = 'd'\r\nnew_value = 4\r\n# Adding the new key-value pair to the dictionary\r\nmy_dict[new_key] = new_value\r\n# Printing the updated dictionary\r\nprint(my_dict)<\/code><\/pre>\n<\/div>\n
Output<\/strong><\/p>\n{‘a’: 1, ‘b’: 2, ‘c’: 3, ‘d’: 4}<\/p>\n