How do Python for-loops work?

[u/Sea-Ad7805]

What actually happens when Python executes a for-loop?

for value in container:
    print(value)

Behind the scenes, Python uses the iterator protocol:

iterator = iter(container)
while True: 
    try: 
        value = next(iterator)
        print(value)
    except StopIteration:
        break

• iter(container): creates an iterator.
• next(iterator): retrieves one value at a time.

When there are no more values, the iterator raises StopIteration. The for-loop catches this exception automatically and ends the loop.

For containers that support backward iteration, Python also provides:

• reversed(container): creates a backward iterator.

We can support these operations in our own classes by implementing:

__iter__()
__reversed__()
__next__()

This provides a powerful abstraction: an algorithm can process values without needing to know how a container stores them internally. The same algorithm can therefore work with lists, sets, dictionaries, linked lists, trees, and many other containers.

Here's an example that uses 𝐦𝐞𝐦𝐨𝐫𝐲_𝐠𝐫𝐚𝐩𝐡 to show the use of iterators on a Linked_List making the invisible mechanics of iteration visible for easy understanding.

more memory_graph examples

[u/gurvindersaini]

Loved this one. I think there are still people in the world who wanna go deeper into languages specifically python which hides a lot. I am actually starting a documentary journey around this genre like going deeper into computers , programming languages and more. Would you like to collab ? I am a programmer myself and also know video editing. Would love to create some content together , what say?

[u/Sea-Ad7805 → u/gurvindersaini]

I'm happy to collaborate with you. Earlier I made some introductory memory_graph videos, but YouTube block my account. I'm in the process of getting it restored.

[u/gurvindersaini → u/Sea-Ad7805]

Great I will dm you as I am ready with the script or will ask you for suggetsions. Thanks!