<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_runtime_config(self, namespace=None):
 """Roll up the runtime config for this class and all children. Implement this to call ``.get_runtime_config()`` on child components or to adjust how it works. For example, if you created a component that has a child component, you could do something like this:: class MyComponent(RequiredConfigMixin):
 def __init__(self, config):
 self.config = config.with_options(self) self.child = OtherComponent(config.with_namespace('source')) def get_runtime_config(self, namespace=None):
 for item in super(MyComponent, self).get_runtime_config(namespace):
 yield item for item in self.child.get_runtime_config(['source']):
 yield item Calling this function can give you the complete runtime configuration for a component tree. This is helpful for doing things like printing the configuration being used including default values. .. Note:: If this instance has a ``.config`` attribute and it is a :py:class:`everett.component.BoundConfig`, then this will try to compute the runtime config. Otherwise, it'll yield nothing. :arg list namespace: list of namespace parts or None :returns: list of ``(namespace, key, option)`` """

        namespace = namespace or []

        cfg = getattr(self, 'config', None)
        if cfg is None or not isinstance(cfg, BoundConfig):
            return

        for key, opt in self.get_required_config().options.items():
            yield (namespace, key, self.config(key, raise_error=False, raw_value=True), opt)