This is the first release of hetio for hetnets in Python. Currently, the following features are supported: creating a hetnet consisting of a metagraph (types) and a graph (nodes and edges) metanode and metaedge abbreviations node and edge properties using the data attribute node and edge masking writing and reading hetnets summary statistics summary visualizations metapath extraction from the metagraph graph traversal to extract paths feature computation, specifically DWPCs The following features are not currently supported: node or edge deletion network permutation (edge swaps) Documentation is lacking, but see these examples of network creation and feature extraction.