code: def quote(src_string, return_expr=False):
    
    node = parse_string(src_string)
    body = node.body
    if len(body) == 1:
      if isinstance(body[0], gast.Expr) and not return_expr:
        out = body[0].value
      else:
        out = body[0]
    else:
      out = node
    return out
docs: Go from source code to AST nodes.
  
    This function returns a tree without enclosing `Module` or `Expr` nodes.
  
    Args:
      src_string: The source code to parse.
      return_expr: Whether or not to return a containing expression. This can be
          set to `True` if the result is to be part of a series of statements.
  
    Returns:
      An AST of the given source code.