code: def match(v1, v2, nomatch=-1, incomparables=None, start=0):
      
      v2_indices = {}
      for i, x in enumerate(v2):
          if x not in v2_indices:
              v2_indices[x] = i
  
      v1_to_v2_map = [nomatch] * len(v1)
      skip = set(incomparables) if incomparables else set()
      for i, x in enumerate(v1):
          if x in skip:
              continue
  
          try:
              v1_to_v2_map[i] = v2_indices[x] + start
          except KeyError:
              pass
  
      return v1_to_v2_map
docs: Return a vector of the positions of (first)
      matches of its first argument in its second.
  
      Parameters
      ----------
      v1: array_like
          Values to be matched
  
      v2: array_like
          Values to be matched against
  
      nomatch: int
          Value to be returned in the case when
          no match is found.
  
      incomparables: array_like
          Values that cannot be matched. Any value in ``v1``
          matching a value in this list is assigned the nomatch
          value.
      start: int
          Type of indexing to use. Most likely 0 or 1