msmu.pp.add_meta

Attach metadata to MuData observations using one explicit metadata key and one obs key.

Metadata can be provided as a pandas DataFrame, a local path-like object, or a URL-like string. File and URL inputs are read into a pandas DataFrame for csv, tsv, parquet, and sdrf formats. Matching is exact only: metadata defaults to its index unless metadata_on is provided, and obs defaults to its index unless obs_columns is provided.