source: utilitiespy/tudelft/utilities/tools/Iterator.py@ 770

from collections.abc import Iterator
from itertools import tee
from typing import Tuple

def hasNext(it)->Tuple[bool, Iterator]:
  '''
  A support function to test hasNext for standard python iterators.
  usage, assuming it is already created (eg it=iter([1,2,3]):
   nx, it = hasNext(it)
   
   After the call, nx will be True iff it has a next value.
   The new it will be in original state (we have to damage the original iterator)
  '''

  it,it1=tee(it)
  try:
    next(it1)
    return True, it
  except:
    return False, it