PyFR is an open-source Python based framework for solving advection-diffusion type problems on streaming architectures using the Flux Reconstruction approach of Huynh. The framework is designed to solve a range of governing systems on mixed unstructured grids containing various element types. It is also designed to target a range of hardware platforms via use of an in-built domain specific language derived from the Mako templating engine. The current release has the following capabilities: * Governing Equations - Euler, Navier Stokes * Dimensionality - 2D, 3D * Element Types - Triangles, Quadrilaterals, Hexahedra, Prisms, Tetrahedra, Pyramids * Platforms - CPU Clusters, Nvidia GPU Clusters, AMD GPU Clusters, Intel Xeon Phi Clusters * Spatial Discretisation - High-Order Flux Reconstruction * Temporal Discretisation - Explicit and Implicit (via Dual Time-Stepping) * Precision - Single, Double * Mesh Files Imported - Gmsh (.msh), CGNS (.cgns) * Solution Files Exported - Unstructured VTK (.vtu, .pvtu)