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## group_restraints() -- create a new set of group restraints

`group_restraints(env, classes, parameters=None)`

> This creates a new set of group restraints. The set is initialized by reading in classes, a file containing a classification of residue:atom pairs into groups. If the parameters argument is also given, this is used to read in a file of restraint parameters, using group_restraints.append().

Example: examples/commands/group_restraints.py

      # Example for: group_restraints()
      from modeller import *
      from modeller.scripts import complete_pdb

      env = environ()
      env.io.atom_files_directory = '../atom_files'
      env.libs.topology.read(file='$(LIB)/top_heav.lib')
      env.libs.parameters.read(file='$(LIB)/par.lib')

      # Allow calculation of statistical (dynamic_modeller) potential
      env.edat.dynamic_modeller = True

      mdl = complete_pdb(env, "1fas")

      # Read Fiser/Melo loop modeling potential
      gprsr = group_restraints(env, classes='$(LIB)/atmcls-melo.lib',
                               parameters='$(LIB)/melo1-dist.lib')
      # Read DOPE loop modeling potential
      #gprsr = group_restraints(env, classes='$(LIB)/atmcls-mf.lib',
      #                         parameters='$(LIB)/dist-mf.lib')
      # Read DOPE-HR loop modeling potential
      #gprsr = group_restraints(env, classes='$(LIB)/atmcls-mf.lib',
      #                         parameters='$(LIB)/dist-mfhr.lib')

      # Use this potential for the 1fas model
      mdl.group_restraints = gprsr

      # Evaluate the loop score of PDB residues 1 through 10
      atmsel = selection(mdl.residue_range('1', '10'))
      atmsel.energy()