How do I nest list comprehensions in Python?

Can you explain how to nest list comprehensions in Python?

Sure! Nesting list comprehensions allows you to create lists within lists. For example, you can create a 2D matrix.

Can you give me an example of a nested list comprehension?

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

What if I want to apply a condition to the nested comprehension?

You can add an if statement. For instance: [[j for j in range(5) if j % 2 == 0] for i in range(3)] will give you even numbers.

That's really helpful! Can you explain how performance compares to regular loops?

Nesting list comprehensions can be more concise and often faster than using nested loops, but readability is key!