Python What is difference between file iterator and list iterator? [duplicate]

Question

If I have a file iterator

with open('test1.txt','r') as f1:
 print(f1.__next__())

But if I do the same thing for a list, it doesn't work.

a1 = [1,2,3,4,5]
a1.__next__()

So, what is difference between file iterator and list iterator? Do file and list (or tuple, dictionary, etc.) iterators behave differently?

BTW, you shouldn't call the __next__ method directly, please use the next function, eg next(f1). The same goes for most other "magic" methods whose names begin & end with double underscores (aka dunder methods). So use the len function, not the __len__ method, the str function, not the __str__ method, etc. — PM 2Ring
– PM 2Ring, Commented Aug 20, 2017 at 17:10

SarathSprakash · Accepted Answer · 2017-08-20 17:41:55Z

1

There is no such file iterator and list iterator.Iterator works on iter objects. List themselves are iterable , but not an iter object, however we can make them iterable.

a =[1,2,3,4,5]
a= iter(a)
a.next()

All python data types except number can be made iterable.

Confused with python lists: are they or are they not iterators?

edited Aug 20, 2017 at 17:41

answered Aug 20, 2017 at 17:01

SarathSprakash

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