Скачать или смотреть [Python for Data Science, AI & Development] 7.Dictionaries

Let's cover Dictionaries in Python. Dictionaries are a type of collection in Python. If you recall, a list is integer indexes. These are like addresses. A list also has elements. A dictionary has keys and values. The key is analogous to the index. They are like addresses, but they don't have to be integers. They are usually characters. The values are similar to the element in a list and contain information. To create a dictionary, we use curly brackets. The keys are the first elements. They must be immutable and unique. Each key is followed by a value separated by a colon. The values can be immutable, mutable, and duplicates. Each key and value pair is separated by a comma. Consider the following example of a dictionary. The album title is the key, and the value is the released data. We can use yellow to highlight the keys and leave the values in white. It is helpful to use the table to visualize a dictionary where the first column represents the keys, and the second column represents the values. We can add a few more examples to the dictionary. We can also assign the dictionary to a variable. The key is used to look at the value. We use square brackets. The argument is the key. This outputs the value.