code: def require_dataset(self, name, shape, dtype=None, exact=False, **kwargs):
          
  
          return self._write_op(self._require_dataset_nosync, name, shape=shape,
                                dtype=dtype, exact=exact, **kwargs)
docs: Obtain an array, creating if it doesn't exist. Other `kwargs` are
          as per :func:`zarr.hierarchy.Group.create_dataset`.
  
          Parameters
          ----------
          name : string
              Array name.
          shape : int or tuple of ints
              Array shape.
          dtype : string or dtype, optional
              NumPy dtype.
          exact : bool, optional
              If True, require `dtype` to match exactly. If false, require
              `dtype` can be cast from array dtype.