code: def write_sig(self):
          '''Write signature to sig store'''
          if not self._md5:
              self._md5 = fileMD5(self)
          with open(self.sig_file(), 'w') as sig:
              sig.write(
                  f'{os.path.getmtime(self)}\t{os.path.getsize(self)}\t{self._md5}'
              f write_sig(self):
          '''Write signature to sig store'''
          if not self._md5:
              self._md5 = fileMD5(self)
          with open(self.sig_file(), 'w') as sig:
              sig.write(
                  f'{os.path.getmtime(self)}\t{os.path.getsize(self)}\t{self._md5}'
              )
docs: Write signature to sig store