new_contents: try:
      str.center
  except:
      import sys
      print("SKIP")
      sys.exit()
  
  print("foo".center(0))
  print("foo".center(1))
  print("foo".center(3))
  print("foo".center(4))
  print("foo".center(5))
  print("foo".center(6))
  print("foo".center(20))
  
subject: Add testcase for str.center().