Think of Python dictionaries as, well, dictionaries. Immutable – meaning that keys must be of data types that cannot be altered, such as strings.Unique – a given key can only exist a single time. In a Python dictionary, you can have multiple keys. In order to access a particular value in a Python dictionary, we use a key in the dictionary to access the value. For example, to access a particular item in a Python list, we can simply reference its index: # Getting the second item in a Python listīecause Python dictionaries aren’t a sequence data type, we can’t simply access, say, the first item. Because lists are sequenced, we can access items based on their position. Unlike Python lists, which are sequence data types, Python dictionaries work a little differently. This is because it’s an array of data that is associated to something else – in this case, a key. They are very similar to what, in other programming languages, is called an associative array. Dictionaries use a key-value pair mapping, allowing you to retrieve a value by looking up its corresponding key. Python dictionaries are container data types, like Python lists.
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