Data access

cell	Get the row of X corresponding to a single cell, based on the cell's name in obs_names.
gene	Get the column of X corresponding to a single gene, based on the gene's name in var_names.
peek_obs	Print a row of obs (the first row, by default) with each column on its own line.
peek_var	Print a row of var (the first row, by default) with each column on its own line.