code: def flagdata(self, msfile, flagfile='', flaglist=[]):
          
  
          if not flagfile:
              # write flag data to text file
              flagfile = os.path.join(self.workdir, 'flags.txt')
              print 'Writing flaglist to %s.' % flagfile
  
              if not flaglist:
                  flaglist = ["mode='unflag'", "mode='shadow'", "mode='clip' clipzeros=True",
                              "mode='rflag' freqdevscale=4 timedevscale=5",
                              "mode='extend' growaround=True growtime=60 growfreq=40 extendpols=True",
                              "mode='quack' quackinterval=20", "mode='summary'"]
  
              with open(flagfile, 'w') as flfile:
                  for flag in flags:
                      flfile.write(flag + '\n')
  
          else:
              print 'Using flags in %s.' % flagfile
  
          print 'Flagging with these commands:'
          for ff in enumerate(open(flagfile)): print ff[1].rstrip()
  
          cfg = tl.FlaglistConfig()  # configure split
          cfg.vis = msfile
          cfg.inpfile = flagfile
          tl.flaglist(cfg)
docs: Use flagfile (first) or flaglist (alternately) to run CASA flagging tool.