class_docstr: Interpret AST nodes to gleam useful debugging information. 
class_docstr_tok: ["Interpret","AST","nodes","to","gleam","useful","debugging","information","."]
code: def visit_Expr(self, expr):
      return self.visit(expr.value)
  
imports: import sys
  import ast
  import py
  from py._code.assertion import _format_explanation, BuiltinAssertionError
label_desc: Use image node_id 4 for calling the DebugInterpreter obj's underlying member method code with example usage: obj.visit_Expr(expr) and returns: self