def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def add_item(self, item_value=None, index=None):
    if item_value is None:
      item_value = self._new_item_default_value