How do I use nested structures in Python?

How do I use nested structures in Python?

Nested structures in Python refer to data structures that contain other data structures, like lists within lists or dictionaries within dictionaries. What specific example are you interested in?

Can you show me an example of a nested list?

Sure! Here's a simple example of a nested list:

nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

You can access elements using two indices, like nested_list[0][1] which would return 2.

What about nested dictionaries?

A nested dictionary example would look like this:

dictionary = {'person': {'name': 'Alice', 'age': 30}, 'city': 'Wonderland'}

You can access the name with dictionary['person']['name'], which returns 'Alice'.

How do I loop through these nested structures?

To loop through a nested list, you can use a nested for loop:

for sublist in nested_list:
    for item in sublist:
        print(item)

For a nested dictionary, you can use:

for key, value in dictionary.items():
    print(key, value)

This will help you access all elements.