code: def migRing(
      populations, k, selection, replacement=None, migarray=None
  ):
      """Perform a ring migration between the *populations*. The migration first
      select *k* emigrants from each population using the specified *selection*
      operator and then replace *k* individuals from the associated population
      in the *migarray* by the emigrants. If no *replacement* operator is
      specified, the immigrants will replace the emigrants of the population,
      otherwise, the immigrants will replace the individuals selected by the
      *replacement* operator. The migration array, if provided, shall contain
      each population's index once and only once. If no migration array is
      provided, it defaults to a serial ring migration (1 -- 2 -- ... -- n --
      1). Selection and replacement function are called using the signature
      ``selection(populations[i], k)`` and ``replacement(populations[i], k)``.
      It is important to note that the replacement strategy must select *k*
      **different** individuals. For example, using a traditional tournament for
      replacement strategy will thus give undesirable effects, two individuals
      will most likely try to enter the same slot.
  
      :param populations: A list of (sub-)populations on which to operate
                          migration.
      :param k: The number of individuals to migrate.
      :param selection: The function to use for selection.
      :param replacement: The function to use to select which individuals will
                          be replaced. If :obj:`None` (default) the individuals
                          that leave the population are directly replaced.
      :param migarray: A list of indices indicating where the individuals from
                       a particular position in the list goes. This defaults
                       to a ring migration.
      """
      nbr_demes = len(populations)
      if migarray is None:
          migarray = list(range(1, nbr_demes)) + [0]
  
      immigrants = [[] for i in range(nbr_demes)]
      emigrants = [[] for i in range(nbr_demes)]
  
      for from_deme in range(nbr_demes):
          emigrants[from_deme].extend(
              selection(populations[from_deme], k)
          )
          if replacement is None:
              # If no replacement strategy is selected, replace those who migrate
              immigrants[from_deme] = emigrants[from_deme]
          else:
              # Else select those who will be replaced
              immigrants[from_deme].extend(
                  replacement(populations[from_deme], k)
              )
  
      for from_deme, to_deme in enumerate(migarray):
          for i, immigrant in enumerate(immigrants[to_deme]):
              indx = populations[to_deme].index(immigrant)
              populations[to_deme][indx] = emigrants[from_deme][i]
  
label_desc: Use image node_id 1 for calling a global function with example usage: migRing(populations, k, selection, replacement, migarray) without return types