def __setitem__(self, i, v):
if isinstance(i, str):
r = [(ii, x) for ii, x in enumerate(self)
if x.get('name', None) == i]
if len(r) > 1:
raise KeyError("There are {} elements named {}.".format(
len(r), i))
elif len(r) == 0:
self.append(v)
else:
CommentedSeq.__setitem__(self, r[0][0], v)
else:
CommentedSeq.__setitem__(self, i, v)
