code: def avoid_name_collisions(filehandle, meta):
      
      if meta.get('avoid_name_collision', True):
          filename = filehandle.filename
          original, ext = os.path.splitext(filehandle.filename)
          counter = count()
          while os.path.exists(get_save_path(filename)):
              fixer = str(next(counter))
              filename = '{}_{}{}'.format(original, fixer, ext)
          filehandle.filename = filename
      return filehandle
docs: Manipulates a filename until it's unique. This can be disabled by
      setting meta['avoid_name_collision'] to any falsey value.