code: def find_reasonable_designs(workspaces, condition=None, verbose=False):
      
      print "Loading designs..."
  
      designs = []
  
      if condition is None:
          condition = 'restraint_dist < 1.2'
  
      for workspace in workspaces:
          for directory in workspace.output_subdirs:
              if verbose:
                  print '  ' + directory
  
              design = structures.Design(directory)
              vars = design.structures.iloc[design.rep].to_dict()
              if pd.eval(condition, local_dict=vars):
                  designs.append(design)
  
      return designs
docs: Return a list of design where the representative model has a restraint
      distance less that the given threshold.  The default threshold (1.2) is
      fairly lenient.