docs: def update_resources(Cnt):
      '''Update resources.py with the paths to the new installed apps.
      '''
  
      # list of path names which will be saved
      key_list = ['PATHTOOLS', 'RESPATH', 'REGPATH', 'DCM2NIIX', 'HMUDIR']
  
      # get the local path to NiftyPET resources.py
      path_resources = cs.path_niftypet_local()
      resources_file = os.path.join(path_resources,'resources.py')
  
      # update resources.py
      if os.path.isfile(resources_file):
          f = open(resources_file, 'r')
          rsrc = f.read()
          f.close()
          # get the region of keeping in synch with Python
          i0 = rsrc.find('### start NiftyPET tools ###')
          i1 = rsrc.find('### end NiftyPET tools ###')
          pth_list = []
          for k in key_list:
              if k in Cnt:
                  pth_list.append('\'' + Cnt[k].replace("\\","/") + '\'')
              else:
                  pth_list.append('\'\'')
  
          # modify resources.py with the new paths
          strNew = '### start NiftyPET tools ###\n'
          for i in range(len(key_list)):
              if pth_list[i] != '\'\'':
                  strNew += key_list[i]+' = '+pth_list[i] + '\n'
          rsrcNew = rsrc[:i0] + strNew + rsrc[i1:]
          f = open(resources_file, 'w')
          f.write(rsrcNew)
          f.close()
  
      return Cnt