You can search for a value if you know the key. They are, next to lists and tuples, one of the basic but most powerful and flexible data structures that Python has to offer. Unlike other data structures, dictionaries hold two items in pairs instead of a single item. Dictionaries are an essential data structure innate to Python, allowing you need to put data in Python objects to process it further. Keys in dictionaries are unique and immutable. A nested dictionary can contain several other nested dictionaries inside it. Python dictionaries can store a wide range of data types, including simple data types such as integers and strings, and more complex data types such as lists, sets, and other dictionaries. Key-value pairs are separated by commas and keys and values are separated by colons. They are just like lists, except instead of having an assigned index number, you make up the index.ĭictionaries are unordered, so the order that the keys are added doesn’t necessarily reflect what order they may be reported back. This Python Dictionary tutorial covers: How to Define a Dictionary How to Access Values in a Dictionary How to Add, Update, and Delete Keys from a. One possible approach to flatten a nested dictionary is to compress its keys.
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