This library provides a simple python interface to the heliophysics data and services of NASA's Coordinated Data Analysis System (CDAS). This library implements the client side of the CDAS RESTful web services and can return data from any of these datasets in a SpacePy datamodel, xarray.Dataset, or pandas.DataFrame with all source and ISTP/SPDF metadata. Frequently asked questions concerning this library are at FAQ. For more general details about the CDAS web services, see https://cdaweb.gsfc.nasa.gov/WebServices/REST/.