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  • Sri Harsha V thinks this is interesting:

files also have a method named __next__ in 3.X (and next in 2.X) that has a nearly identical effect—it returns the next line from a file each time it is called. The only noticeable difference is that __next__ raises a built-in StopIteration exception at end-of-file instead of returning an empty string:

>>>...
            
        
			

From

Cover of Learning Python, 5th Edition

Note

So, in effect this next(in python 2.x) and next method is what makes a python object iterable.