code: def instantiate_component(self, component, callback=None):
          
  
          profile = self.__components[component]
          callback and callback(profile)
  
          LOGGER.debug("> Current Component: '{0}'.".format(component))
  
          if os.path.isfile(os.path.join(profile.directory, profile.package) + ".py") or \
                  os.path.isdir(os.path.join(profile.directory, profile.package)):
              path = profile.directory
          elif os.path.basename(profile.directory) == profile.package:
              path = os.path.join(profile.directory, "..")
          not path in sys.path and sys.path.append(path)
  
          profile.module = __import__(profile.package)
          object = profile.attribute in profile.module.__dict__ and getattr(profile.module, profile.attribute) or None
          if object and inspect.isclass(object):
              instance = object(name=profile.name)
              for category, type in self.__categories.iteritems():
                  if type.__name__ in (base.__name__ for base in object.__bases__):
                      profile.category = category
                      profile.interface = instance
                      LOGGER.info("{0} | '{1}' Component has been instantiated!".format(
                          self.__class__.__name__, profile.name))
                      return True
          else:
              del (self.__components[component])
              raise manager.exceptions.ComponentInterfaceError(
                  "{0} | '{1}' Component has no Interface and has been rejected!".format(self.__class__.__name__,
                                                                                         profile.name))
docs: Instantiates given Component.
  
          Usage::
  
              >>> manager = Manager()
              >>> manager.register_component("tests_component_a.rc")
              True
              >>> manager.instantiate_component("core.tests_component_a")
              True
              >>> manager.get_interface("core.tests_component_a")
              <tests_component_a.TestsComponentA object at 0x17a5b90>
  
          :param component: Component to instantiate.
          :type component: unicode
          :param callback: Callback object.
          :type callback: object