pyMOR is a software library developed at the University of Münster for building model order reduction applications with the Python programming language. Its main focus lies on the reduction of parameterized partial differential equations using the reduced basis method. All algorithms in pyMOR are formulated in terms of abstract interfaces for seamless integration with external high-dimensional PDE-solver. Moreover, pure Python implementations of finite element and finite volume discretizations using the NumPy/SciPy scientific computing stack are provided for getting started quickly.