<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def exclude_time(self, start, end, days):
 """Added an excluded time by start, end times and the days. ``start`` and ``end`` are in military integer times (e.g. - 1200 1430). ``days`` is a collection of integers or strings of fully-spelt, lowercased days of the week. """

        self._excluded_times.append(TimeRange(start, end, days))
        return self