code: def to_list(x):
      
      if isinstance(x, list):
          return x
      if not isinstance(x, dict):
          try:
              return list(x)
          except TypeError:
              pass
      return [x]
docs: Convert a value to a list.
  
      Parameters
      ----------
      x
          Value.
  
      Returns
      -------
      `list`
  
      Examples
      --------
      >>> to_list(0)
      [0]
      >>> to_list({'x': 0})
      [{'x': 0}]
      >>> to_list(x ** 2 for x in range(3))
      [0, 1, 4]
      >>> x = [1, 2, 3]
      >>> to_list(x)
      [1, 2, 3]
      >>> _ is x
      True