In python, you can iterate over an iterable by using a for loop.

• https://docs.python.org/3/tutorial/controlflow.html#for-statements

Usually, iterating is done over a range object, but you can iterate over every iterable in python, like over the chars inside of a string.

>>>for char in "abcdefg":
       print(char)

a
b
c
d
e
f
g
>>>

It is possible to change the size of a list while iterating over it. However, when iterating over a dict, changing it's size throws an error