docstr: A string representing the interval in list form.
docstr_tok: ["A","string","representing","the","interval","in","list","form","."]
code: def __str__(self):
      """
      A string representing the interval in list form.
      """
      return "[%s]" % (self._str_base())
  
imports: from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.core.sympify import sympify
  from sympy.core.numbers import Integer
label_desc: Use image node_id 16 for calling the PlotInterval obj's underlying member method code with example usage: obj.__str__() and returns: unknown