code: def visitDefault(self, node):
      nodename = "%s(" % clsname(node)
  
      self.print(nodename, noindent=True)
  
      undefined = [
          attr for attr in node._fields if not hasattr(node, attr)
      ]
      if undefined:
          warn(
              "ast node %r does not have required field(s) %r "
              % (
                  clsname(node),
                  undefined,
              ),
              stacklevel=2,
          )
      undefined = [
          attr for attr in node._attributes if not hasattr(node, attr)
      ]
      if undefined:
          warn(
              "ast does %r not have required attribute(s) %r "
              % (
                  clsname(node),
                  undefined,
              ),
              stacklevel=2,
          )
  
      children = sorted(
          [
              (attr, getattr(node, attr))
              for attr in node._fields
              if hasattr(node, attr)
          ]
      )
  
      with self.indent(len(nodename)):
          i = 0
          while children:
              attr, child = children.pop(0)
              if isinstance(child, (list, tuple)):
                  text = "{attr}=[".format(attr=attr)
                  self.print(text)
                  with self.indent(len(text)):
                      for j, inner_child in enumerate(child):
                          if isinstance(inner_child, _ast.AST):
                              self.visit(inner_child)
                          else:
                              self.print(repr(inner_child))
                          if j < (len(child) - 1):
                              self.print(
                                  ", {nl}{idnt}",
                                  nl=self.newline,
                                  idnt=self._indent,
                              )
  
                  self.print("]")
              else:
                  text = "{attr}=".format(attr=attr)
  
                  self.print(text)
                  with self.indent(len(text)):
                      if isinstance(child, _ast.AST):
                          self.visit(child)
                      else:
                          self.print(repr(child))
  
              if children:
                  self.print(
                      ", {nl}{idnt}", nl=self.newline, idnt=self._indent
                  )
  
              i += 1
  
      self.print(")")
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ...asttools import Visitor
  import sys
  import _ast
  from warnings import warn
label_desc: Use image node_id 6 for calling the ASTPrinter obj's underlying member method code with example usage: obj.visitDefault(node) without return types