Intro to Sequential Data Types

This is part of “An intro to Python” series of posts, with content from the Enki app. If you stumbled upon this, you can start from the beginning.

There are several different sequential data types in Python. These are ones that are ordered in a defined sequence.

Strings are an example of a sequential data type.

Elements in sequential data types can be accessed via their indexes.

Indexes are basically measures of position. All elements within a variable start at index 0.

The index used must be valid:

Strings are also an immutable data type which means that items cannot be reassigned.

Most python objects (booleans, integers, floats, strings, and tuples) are immutable. This means that after you create the object and assign some value to it, you can’t modify that value.


Tuples are another sequential and immutable data type.

They’re used to group any number of items, regardless of their type, into a single value.

A tuple is created by separating items with commas, and are often wrapped in optional parentheses () to make them stand out.

Again, we can extract elements from tuples using the index operator, and items cannot be reassigned:

Tuples are mostly used when we need to store values of multiple different types, such as for database fields or CSV column names.

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