class_docstr: An ASCII picture.
  The pictures are represented as a list of equal length strings.
class_docstr_tok: ["An","ASCII","picture",".","The","pictures","are","represented","as","a","list","of","equal","length","strings","."]
code: def __str__(self):
      return "\n".join(self.picture)
  
imports: import shutil
  from .pretty_symbology import hobj, vobj, xsym, xobj, pretty_use_unicode, line_width, center
  from sympy.utilities.exceptions import sympy_deprecation_warning
label_desc: Use image node_id 18 for calling the stringPict obj's underlying member method code with example usage: obj.__str__() and returns: str