code: def find_in_sections(var_name, app_name):
      
      sections = get_sections(app_name)
  
      if not sections:
          raise ValueError('No sections found in {} rcfiles.'.format(app_name))
  
      for s in sections:
          try:
              var_value = get_rcfile_variable_value(var_name, section_name=s,
                                                    app_name=app_name)
          except:
              pass
          else:
              return s, var_value
  
      raise KeyError('No variable {} has been found in {} '
                     'rcfiles.'.format(var_name, app_name))
docs: Return the section and the value of the variable where the first
      var_name is found in the app_name rcfiles.
  
      Parameters
      ----------
      var_name: str
          Name of the variable to be searched for.
  
      app_name: str
          Name of the application to look for its rcfiles.
  
      Returns
      -------
      section_name: str
          Name of the section in the rcfiles where var_name was first found.
  
      var_value: str
          The value of the first variable with given var_name.