What is nested list comprehension in Python?

Can you explain what nested list comprehension is in Python?

Sure! 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?

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

How does this example work step by step?

In this example, the outer loop iterates 4 times (for i), and for each iteration, the inner loop creates a list of 3 elements (for j). The result is a list of lists.

What are the advantages of using nested list comprehension?

Nested list comprehension is more concise and often more readable than using nested loops, making your code cleaner and easier to understand.