def insert(self, index, key, val):
        if key in self:
            raise KeyError('Key %r already exists.' % key)
        dict.__setitem__(self, key, val)
        self._keys.insert(index, key)
Insert val at index if key not in odict
dataset/ETHPy150Open ioflo/ioflo/ioflo/aid/odicting.py/odict.insert