code: def merge(self, indict):
          
          for key, val in list(indict.items()):
              if (key in self and isinstance(self[key], dict) and
                                  isinstance(val, dict)):
                  self[key].merge(val)
              else:
                  self[key] = val
docs: A recursive update - useful for merging config files.
  
          >>> a = '''[section1]
          ...     option1 = True
          ...     [[subsection]]
          ...     more_options = False
          ...     # end of file'''.splitlines()
          >>> b = '''# File is user.ini
          ...     [section1]
          ...     option1 = False
          ...     # end of file'''.splitlines()
          >>> c1 = ConfigObj(b)
          >>> c2 = ConfigObj(a)
          >>> c2.merge(c1)
          >>> c2
          ConfigObj({'section1': {'option1': 'False', 'subsection': {'more_options': 'False'}}})