def get_file_original_name(name):
 re_match = re.findall('.*_sep_(.*)', name)
 if re_match:
  return re_match[0]
 else:
  return 'Not valid'

def get_file_original_name ( name ) : re_match = re . findall ( '.*_sep_(.*)' , name ) if re_match : return re_match [ 0 ] else : return 'Not valid'
use this function to get the users original filename .