old_contents: #!/usr/bin/env python3
  
  import argparse
  from collections import defaultdict
  import os
  import shutil
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('inPlaceDir', type=str, help="Directory to prune in-place.")
      parser.add_argument('--numImagesThreshold', type=str,
                          help="Delete directories with less than this many images.",
                          default=10)
      args = parser.parse_args()
  
      exts = ["jpg", "png"]
  
      for subdir, dirs, files in os.walk(args.inPlaceDir):
          if subdir == args.inPlaceDir: continue
          nImgs = 0
          for fName in files:
              (imageClass, imageName) = (os.path.basename(subdir), fName)
              if any(imageName.lower().endswith("." + ext) for ext in exts):
                  nImgs += 1
          if nImgs < args.numImagesThreshold:
              print("Removing {}".format(subdir))
              shutil.rmtree(subdir)
  
new_contents: #!/usr/bin/env python3
  
  import argparse
  from collections import defaultdict
  import os
  import shutil
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('inPlaceDir', type=str,
                          help="Directory to prune in-place.")
      parser.add_argument('--numImagesThreshold', type=str,
                          help="Delete directories with less than this many images.",
                          default=10)
      args = parser.parse_args()
  
      exts = ["jpg", "png"]
  
      for subdir, dirs, files in os.walk(args.inPlaceDir):
          if subdir == args.inPlaceDir:
              continue
          nImgs = 0
          for fName in files:
              (imageClass, imageName) = (os.path.basename(subdir), fName)
              if any(imageName.lower().endswith("." + ext) for ext in exts):
                  nImgs += 1
          if nImgs < args.numImagesThreshold:
              print("Removing {}".format(subdir))
              shutil.rmtree(subdir)
  
subject: Fix pep8 warnings.