code: def pluck(col, key, default=None):
      
      if not (is_list(col) or is_tuple(col)):
          fail("First argument must be a list or tuple")
  
      def _block(dct):
          if not is_dict(dct):
              return []
          return dct.get(key, default)
  
      return map(_block, col)
docs: Extracts a list of values from a collection of dictionaries
  
          >>> stooges = [{"name": "moe",   "age": 40},
          ...            {"name": "larry", "age": 50},
          ...            {"name": "curly", "age": 60}]
          >>> pluck(stooges, "name")
          ['moe', 'larry', 'curly']
  
          It only works with collections
  
          >>> curly = stooges.pop()
          >>> pluck(curly, "age")
          Traceback (most recent call last):
          ...
          RuntimeError: First argument must be a list or tuple