What are nested loops in Python and how do they work?

What are nested loops in Python and how do they work?

Nested loops are loops within loops. In Python, you can place one loop inside another to iterate over multiple sequences.

Can you give me an example of a nested loop?

Sure! Here's a simple example:

for i in range(3):
    for j in range(2):
        print(f'i: {i}, j: {j}')

This will print combinations of i and j.

What happens if I have a loop inside a loop that has a different range?

The inner loop will run completely for each iteration of the outer loop. For example, if the outer loop runs 3 times and the inner loop runs 2 times, the inner loop will execute a total of 6 times.

Are there any performance considerations with nested loops?

Yes, nested loops can lead to performance issues, especially with large datasets, as the time complexity increases. It's important to optimize them when possible.