code: def _isub(self, other):
  		
  		if isinstance(other, _basebag):
  			for elem, other_count in other.counts():
  				try:
  					self._increment_count(elem, -other_count)
  				except ValueError:
  					self._set_count(elem, 0)
  		else:
  			for elem in other:
  				try:
  					self._increment_count(elem, -1)
  				except ValueError:
  					pass
  		return self
docs: Discard the elements of other from self.
  
  		if isinstance(it, _basebag):
  			This runs in O(it.num_unique_elements())
  		else:
  			This runs in O(len(it))