<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_result(self, commit, default=MemoteResult()):
 """Return an individual result from the history if it exists."""

        assert self._results is not None, \
            "Please call the method `load_history` first."
        return self._results.get(commit, default)