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pyEFP is a library and tools to represent large molecules as a union of small effective fragments. You can find more information about effective fragments potential in the following publications: 1) Mark S. Gordon, Dmitri G. Fedorov, Spencer R. Pruitt and Lyudmila V. Slipchenko, "Fragmentation Methods: A Route to Accurate Calculations on Large Systems", Chem. Rev., 2012, V. 112, Pp. 632-672 2)Ilya A. Kaliman and Lyudmila V. Slipchenko, "LIBEFP: A New Parallel Implementation of the Effective Fragment Potential Method as a Portable Software Library", J. Comp. Chem., 2013, V. 34, Pp. 2284-2292. The project consists of several files: pyEFP.py - a library to read, write and store EFP data. fragrepr.py - a library to subdivide molecule into fragments. convert2EFP.py - a tool to generate input file for large molecule in GAMESS format. gencluster.py - a tool to construct a shell of given thickness around the QM part of the system. CreateNewFragment.py - a tool to calculate new effective fragment and add it to the database