What does a Python for-loop do?

for_loop.py

# If we were to implement a Python for-loop in Python, 

for x in my_iterable:
    do_stuff(x)
    
# it would be equivalent to the following:

iterator = iter(my_iterable)
while True:
    try:
        x = next(iterator)
    except StopIteration:
        break
    do_stuff(x)
    
# note iter(something) returns something.__iter()__
# and next(another_thing) returns another_thing.__next__()