The space_packet_parser Python library is a generalized, configurable packet decoding library for CCSDS telemetry packets based on the XTCE standard for packet structure definitions. The core functionality of the library is the configuration of a Parser object by a static XTCE XML document. The configured Parser can then iterate through binary data, parsing and returning ParsedPacket objects containing the decoded packet field values in a memory efficient generator pattern. The binary string may originate from an in-memory bit stream, a buffered file reader opened in binary mode, or a python socket object; in every case, a small buffer is used to read chunks of data to ensure that memory usage is minimal. The space_packet_parser library supports robust error handling and is capable of skipping malformed packet structures and unidentified packet structures and can dynamically parse mixed APID packet streams. The `Parser.generator` object supports keyword arguments for debugging such as the ability to return unraised parsing errors, which contain partial instances of parsed packet data to aid in debugging.