For loop with 2 elements. No zip

[amassotti]

Hello everybody.

I've a doubt about the for loop with two elements like this:

d1 = (1,2)
d2 = (3,4)

for item in (d1, d2):
    print(item)

#Output

Output:
(1, 2)
(3, 4)

Why I'm not iterating on all elements of d1 and after on d2 but receive the tuple and not single integers?


If I insert only one element I can iterate on the iterable (tuple) and print the sequence of integers:

for item in (d1):
    print(item)

#Output

Output:
1
2

If I use the zip with both of them, I iterate at the same time of both and print two new tuples:

for item in zip(d1, d2):
    print(item)

#Output

Output:
(1, 3)
(2, 4)

It's clear for me at this point.
However I cannot understand the firt case.
Thanks a lot.