class_docstr: A line-based string reader.
  
      
code: def read_to_next_unindented_line(self):
      def is_unindented(line):
          return line.strip() and (len(line.lstrip()) == len(line))
  
      return self.read_to_condition(is_unindented)
  
imports: import inspect
  import textwrap
  import re
  import pydoc
  from warnings import warn
  import collections
  import sys
  from packaging.version import Version
label_desc: Use image node_id 9 for calling the Reader obj's underlying member method code with example usage: obj.read_to_next_unindented_line() and returns: self, unknown