When did the number got included in the list?

[Frankduc]

I saw similar examples in https://www.programiz.com/python-programming/iterator
Generator are in curly brackets like a tuple but they are object that return a list.
I like the use you made of list (zip) much fater than while:

coordinate = []

y = 0
while y < 10:
    x = 0
    while x < 10:
        coordinate.append((x,y))
        x += 1
    coordinate.append((x,y))
    y += 1
    
for x in coordinate:
     print(x)

Thanks for the tips.