scikit-fem is a pure Python library for performing finite element assembly. Its main purpose is the transformation of bilinear forms into sparse matrices and linear forms into vectors. The library - has minimal dependencies - contains no compiled code - supports one-dimensional, triangular, quadrilateral, tetrahedral and hexahedral finite elements - includes special elements such as Raviart-Thomas, Nedelec, MINI, Crouzeix-Raviart, Argyris, ...