def hash(self):
        """Hash value based on file name and .ini file content"""
        if self._hash is None:
            # Only hash _camera.ini and _para.ini
            fsh = [self.path.with_name(self._mid + "_camera.ini"),
                   self.path.with_name(self._mid + "_para.ini")]
            tohash = [hashfile(f) for f in fsh]
            tohash.append(self.path.name)
            # Hash a maximum of ~1MB of the tdms file
            tohash.append(hashfile(self.path, blocksize=65536, count=20))
            self._hash = hashobj(tohash)
        return self._hash
Hash value based on file name and .ini file content