code: def unbuild_month(self, dt):
          
          self.year = str(dt.year)
          self.month = str(dt.month)
          logger.debug("Building %s-%s" % (self.year, self.month))
          target_path = os.path.split(self.get_build_path())[0]
          if self.fs.exists(target_path):
              logger.debug("Removing {}".format(target_path))
              self.fs.removetree(target_path)
docs: Deletes the directory at self.get_build_path.