code: def set_verbosity_level(self, verbosity_level):
          
  
          self.__verbosity_level = verbosity_level
          foundations.verbose.set_verbosity_level(verbosity_level)
          self.__settings.set_key("Settings", "verbosity_level", verbosity_level)
          self.verbosity_level_changed.emit(verbosity_level)
          return True
docs: Sets the Application verbosity level.
  
          :param verbosity_level: Verbosity level.
          :type verbosity_level: int
          :return: Method success.
          :rtype: bool
  
          :note: The expected verbosity level value is an integer between 0 to 4.