old_contents: import glob
  import shlex
  import subprocess
  from natsort import natsorted
  
  
  list_files = glob.glob("figures/*")
  list_files_20pts = natsorted([f for f in list_files if "20_npts" in f])
  list_files_100pts = natsorted([f for f in list_files if "100_npts" in f])
  
  print "\n".join(list_files_20pts)
  
  str_20pts = " ".join(list_files_20pts)
  str_100pts = " ".join(list_files_100pts)
  
  cmd = "convert -delay 80 -loop 0 %s figures/tang_20pts.gif" % str_20pts
  subprocess.call(shlex.split(cmd))
  
  cmd = "convert -delay 80 -loop 0 %s figures/tang_100pts.gif" % str_100pts
  subprocess.call(shlex.split(cmd))
  
new_contents: import glob
  import shlex
  import subprocess
  from natsort import natsorted
  
  
  list_files = glob.glob("figures/*")
  list_files_20pts = natsorted([f for f in list_files if "20_npts" in f])
  list_files_100pts = natsorted([f for f in list_files if "100_npts" in f])
  
  str_20pts = " ".join(list_files_20pts)
  str_100pts = " ".join(list_files_100pts)
  
  cmd = "convert -delay 80 -resize 600x600 -loop 0 %s figures/tang_20pts.gif" % str_20pts
  subprocess.call(shlex.split(cmd))
  
  cmd = "convert -delay 80 -resize 600x600 -loop 0 %s figures/tang_100pts.gif" % str_100pts
  subprocess.call(shlex.split(cmd))
  
subject: Remove print