How to specify where to start in an itertools.cycle function

Question

I need to cycle through a list for starting position between 1-4 using itertools I am able to cycle through the list

positions = it         


        

Answer 1

Use slices of the original list:

In [15]: def custom_slice(lst, start):
   ....:     return cycle(lst[start:] + lst[:start + 1])

Demo:

In [16]: positions = custom_slice(lst, 2)

In [17]: next(positions)
Out[17]: 3

In [18]: next(positions)
Out[18]: 4

In [19]: next(positions)
Out[19]: 1

In [20]: next(positions)
Out[20]: 2