Tuples are made of several items, just like a list, but they cannot be modified in any way. They are widely used internally in many of the systems we depend on, like databases. Tuples hold data in the order we supply it, & we can access the elements inside a tuple with an index.
For example, if we have a tuple like
('chocolate chip cookies', 15) & we want to access each part of the data, we can use an index just like a list. Tuples are easier to process & more memory efficient than lists.
They are immutable, which means we cannot add or remove elements from them. This property of tuple is important because we can use them to ensure that our data is not altered. We can create tuples by pairing up elements.
Often, we will have lists where we want to match up elements into pairs, & the zip function enables us to do that. Tuples are commonly created by zipping lists together with
Here we have a list of most popular cookies in the US & India, & we want to build a list of pairs by the popularity rank of the cookie in each country, & we will pass them to the zip function. Then we print the result of the
zip, & we get what looks like a list of Tuples.
We have two lists:
Notice that the tuples use parenthesis as their object representation.
Tuple unpacking, also sometimes called tuple expansion, allows us to assign the elements of a tuple to named variables for later use. Unpacking tuples is a very expressive way of working with data.
The below syntax allows us to create a more readable & less error-prone code. Here we have a tuple containing top-ranked cookie from two countries, & we want to store them as
in_num_1 so that we can print them name by name.
We start by putting both variables as the target of the assignment statement separated by a comma. Then assign the first tuple in our
top_pairs list to them.
Here we build a
for loop that uses tuple unpacking when iterating over the
top_pairs list. It splits each tuple in the list into its Indian & US cookie elements. We then use each of these variables to print the cookies in order.
Another useful tuple creation method is the
enumerate() function. Enumeration is used in loops to return the position & the data in that position while looping.
Here we enumerate our top pairs list & split that resulting tuple into index
Lists and Tuples in Python - Real Python
You'll cover the important characteristics of lists and tuples in Python 3. You'll learn how to define them and how to…