<\/p>\n\n\n\n
In Python, a dictionary is an unordered, mutable, and indexed data structure. It stores data in key-value pairs and provides a way to retrieve the value for any given key. Dictionaries are an important and versatile data structure in Python and are widely used in various kinds of programming tasks.<\/p>\n\n\n\n
A dictionary in Python is defined by key-value pairs enclosed in curly braces You can access the value for a given key using square brackets If you try to access a key that does not exist in the dictionary, Python will raise a KeyError. To avoid this, you can use the You can add a new key-value pair to a dictionary by assigning a value to a new key:<\/p>\n\n\n\n You can also change the value of an existing key the same way:<\/p>\n\n\n\n The You can loop through a dictionary to access its keys and values:<\/p>\n\n\n\n This will print each key and its corresponding value.<\/p>\n\n\n\n In summary, dictionaries in Python are a powerful tool for storing and managing data. They allow you to connect pieces of related information and efficiently access or modify them.<\/p>\n","protected":false},"excerpt":{"rendered":" Learning about dictionaries In Python, a dictionary is an unordered, mutable, and indexed data structure. It stores data in key-value pairs and provides a way to retrieve the value for…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[107,109,94],"tags":[],"class_list":["post-131","post","type-post","status-publish","format-standard","hentry","category-data-structures","category-dictionaries","category-introduction-to-python-2"],"featured_image_src":null,"author_info":{"display_name":"shababdoo","author_link":"https:\/\/python.garden\/index.php\/author\/shababdoo\/"},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/posts\/131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/comments?post=131"}],"version-history":[{"count":0,"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/posts\/131\/revisions"}],"wp:attachment":[{"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/media?parent=131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/categories?post=131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/python.garden\/index.php\/wp-json\/wp\/v2\/tags?post=131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}{}<\/code>, with pairs separated by commas. Each key-value pair is separated by a colon :<\/code>. Here’s an example:<\/p>\n\n\n\nstudent = {\n "name": "Alice",\n "age": 20,\n "courses": ["math", "comp sci"]\n}<\/pre><\/div>\n\n\n\nAccessing Values<\/h2>\n\n\n\n
[]<\/code>:<\/p>\n\n\n\nprint(student["name"]) # prints: Alice<\/pre><\/div>\n\n\n\n
get<\/code> method, which returns None<\/code> if the key is not found.<\/p>\n\n\n\nprint(student.get("grade")) # prints: None<\/pre><\/div>\n\n\n\nAdding and Changing Items<\/h2>\n\n\n\n
student["grade"] = "A"<\/pre><\/div>\n\n\n\n
student["age"] = 21<\/pre><\/div>\n\n\n\n
Removing Items<\/h2>\n\n\n\n
del<\/code> keyword can be used to remove a key-value pair from a dictionary:<\/p>\n\n\n\ndel student["age"]<\/pre><\/div>\n\n\n\n
Looping Through a Dictionary<\/h2>\n\n\n\n
for key in student:\n print(key, student[key])<\/pre><\/div>\n\n\n\n