Get object from AnnData: get

Get object from `AnnData`: `get`#

The module sc.get provides convenience functions for getting values back in useful formats.

`get.obs_df`	Return values for observations in adata.
`get.var_df`	Return values for observations in adata.
`get.rank_genes_groups_df`	`scanpy.tl.rank_genes_groups()` results in the form of a `DataFrame`.
`get.aggregate`	Aggregate data matrix based on some categorical grouping.