What is nested list comprehension in Python?

What is nested list comprehension in Python?

Nested list comprehension is a concise way to create lists within lists in Python. It allows you to generate a new list by applying an expression to each element in a nested iterable.

Can you give me an example of nested list comprehension?

Sure! Here's an example: [[j for j in range(3)] for i in range(4)] creates a 4x3 matrix.

How does this differ from regular list comprehension?

In regular list comprehension, you iterate over a single iterable. In nested list comprehension, you have an outer loop and an inner loop, allowing you to work with multi-dimensional data.

When should I use nested list comprehension?

Use nested list comprehension when you need to create a list of lists or when working with multi-dimensional data, as it can make your code more concise and readable.