Opening a file: what is going on here with this instantiation?

[opalko]

I came across this short snippet of code to jump to a specific line (11 in this case) in a text file:

with open('mytextfile.txt') as f:
    for i in range(10):
        f, next(f)
    for line in f:
        print(line)

And it works great but I am totally clueless what the line

        f, next(f)

is doing. I didn’t even know it was possible to reference the file object without doing anything to it! What is going on here? I am much more used to doing something like this:

with open('anothertextfile.txt', 'r') as fileobj:
    for row in fileobj:
        print(row)

where fileobj is the entire file, is it not? So how is “f, next(f)” being used in the preceding example?

Cheers for any help

[camperextraordinaire]

@opalko

f, next(f)

Not sure what the f, part is for because next(f) by itself on that line will work just fine. next can be used with any iterable, so f must be iterable. In this case, it basically just skips to the next line of the file each time it is called.