PyAMF provides Action Message Format (AMF) support for Python that is compatible with the Flash Player. It includes integration with Python web frameworks like Django, Pylons, Twisted, and more.

The Adobe Integrated Runtime and Flash Player use AMF to communicate between an application and a remote server. AMF encodes remote procedure calls (RPC) into a compact binary representation that can be transferred over HTTP/HTTPS or the RTMP/RTMPS protocol. Objects and data values are serialized into this binary format, which increases performance, allowing applications to load data up to 10 times faster than with text-based formats such as XML or SOAP.

AMF 3, the default serialization for ActionScript 3.0, provides various advantages over AMF0, which is used for ActionScript 1.0 and 2.0. AMF 3 sends data over the network more efficiently than AMF 0. AMF 3 supports sending int and uint objects as integers and supports data types that are available only in ActionScript 3.0, such as ByteArray, ArrayCollection, and IExternalizable.