code: def instantiate_components(self, callback=None):
          
  
          uninstantiated_components = [component
                                       for component in self.list_components()
                                       if not self.instantiate_component(component, callback)]
          if not uninstantiated_components:
              return True
          else:
              raise manager.exceptions.ComponentInstantiationError(
                  "{0} | '{1}' Components failed to instantiate!".format(self.__class__.__name__,
                                                                         ", ".join(uninstantiated_components)))
docs: Instantiates the Components.
  
          Usage::
  
              >>> manager = Manager((tests_manager,))
              >>> manager.register_components()
              True
              >>> manager.instantiate_components()
              True
              >>> manager.get_interface("core.tests_component_a")
              <tests_component_a.TestsComponentA object at 0x17a5bb0>
  
          :param callback: Callback object.
          :type callback: object