For loop

Question

I can't understand what a for loop is, especially when it comes to " for i in ...." I could not understand the i function in it, that is what confuses me about the for loop. Can somebody please tell me what a for loop is? Thank you

Answer 1

A loop has a head and a body. In the head you set the condition for the loop, and for every loop, the code in the body will be executed:

for i in [3, 5, 9]:
print(i)

In the for loop above, i is a variable that assign the value in the list [3, 5, 9], one value at every loop.
There are three values in the list, so at the first loop i = 3, next loop i = 5 and in the last loop i = 9
In every loop the code in body vill be executed:

print(i).

So the loop above vill be the same as write the code:

print(3)
print(5)
print(9)

Answer 2

If it helps, read it like, “For every item in the iterable…”
That iterable can be a list, tuple, set, etc. or could also be a range object.
It will run through each item in the iterable and do/calculate something

Answer 3

Thank you soo much, it is really clear now.