def __delitem__(self,key) :
		key = key.lower()
		try:
			dict.__delitem__(self, key)
		except __HOLE__:
			pass
		try:
			self._fields.remove(key)
		except ValueError:
			pass
dataset/ETHPy150Open matthew-brett/bibstuff/bibstuff/bibfile.py/BibEntry.__delitem__