code: def force_delete_file(file_path):
          ''' force delete a file '''
          if os.path.isfile(file_path):
              try:
                  os.remove(file_path)
                  return file_path
              except:           
                  return FileSystemUtils.add_unique_postfix(file_path)
          else:
              return file_patf force_delete_file(file_path):
          ''' force delete a file '''
          if os.path.isfile(file_path):
              try:
                  os.remove(file_path)
                  return file_path
              except:           
                  return FileSystemUtils.add_unique_postfix(file_path)
          else:
              return file_path
docs: force delete a file