docs: def _yield_week_day(self, enumeration=False):
          """A helper function to reduce the number of nested loops.
          
          Parameters
          ----------
          enumeration
              Whether or not to wrap the days in enumerate().
              
      
          Yields
          -------
          tuple
              A tuple with (week, day_index, day) or (week, day),
              depending on 'enumeration' parameter.
  
          """
          if enumeration:
              # Iterate over all weeks
              for week in range(1, self.duration + 1):
                  # Iterate over all days
                  for day_index, day in enumerate(self.days):
                      yield (week, day_index, day)
          else:
              # Iterate over all weeks
              for week in range(1, self.duration + 1):
                  # Iterate over all days
                  for day in self.days:
                      yield (week, day)