code: def newer(source, target):
      """
      Return true if 'source' exists and is more recently modified than
      'target', or if 'source' exists and 'target' doesn't.  Return false if
      both exist and 'target' is the same age or younger than 'source'.
      """
      if not os.path.exists(source):
          raise ValueError(
              "file '%s' does not exist" % os.path.abspath(source)
          )
      if not os.path.exists(target):
          return 1
  
      mtime1 = os.stat(source)[ST_MTIME]
      mtime2 = os.stat(target)[ST_MTIME]
  
      return mtime1 > mtime2
  
imports: import os
  import numpy
  import argparse
  from stat import ST_MTIME
label_desc: Use image node_id 1 for calling a global function with example usage: newer(source, target) and returns: unknown, int