Let’s continue our little research of itertools module.

Today we’ll have a look at 3 infinite iterator constructors:

from itertools import count, cycle, repeat

Imagine, you need to iterate over some N iterables.

For example, you have two lists: l1 and l2.

In [2]: l1 = list(range(5))
In [3]: l2 = list(range(10))

In [4]: l1
Out[4]: [0, 1, 2, 3, 4]

In [5]: l2
Out[5]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Here is the easiest way to do so:

Imagine, you iterate through a collection, which contains some other collections.

Like so: list of lists

In [32]: L = [ [i] for i in range(10) ]

In [33]: L
Out[33]: [[0], [1], [2], [3], [4], [5], [6], [7], [8], [9]]

One obvious way to iterate over inner values is to use indexing: