pandera.schemas.DataFrameSchema.to_yaml# DataFrameSchema.to_yaml(stream: None = None) → str[source]# DataFrameSchema.to_yaml(stream: os.PathLike) → None Write DataFrameSchema to yaml file. Parameters stream (Optional[PathLike]) – file stream to write to. If None, dumps to string. Return type Optional[str] Returns yaml string if stream is None, otherwise returns None.