code: def first(thing, n=0):
      
      n = to_int(n)
      if is_list(thing) or is_tuple(thing):
          if len(thing) == 0:
              return None
          if n > 0:
              return thing[0:n]
          return thing[0]
      return thing
docs: get the first element of a list
  
          >>> lst = [1, 2, 3, 4, 5]
          >>> first(lst)
          1
          >>> first(lst, 3)
          [1, 2, 3]
          >>> first(lst, 10)
          [1, 2, 3, 4, 5]
          >>> first({"key": "value"})
          {'key': 'value'}
          >>> first(("a", "b", "c"))
          'a'
          >>> first([''])
          ''
          >>> first([''], 5)
          ['']
          >>> first(['', ''])
          ''
          >>> first(False)
          False
          >>> first("")
          ''
          >>> first(None)
          >>> first([])