def _set_size_code(self):
if not self._op.startswith(self.SIZE):<EOL><INDENT>self._size_code = None<EOL>return<EOL><DEDENT>if len(self._op) == len(self.SIZE):<EOL><INDENT>self._size_code = self.SZ_EQ<EOL><DEDENT>else:<EOL><INDENT>suffix = self._op[len(self.SIZE):]<EOL>self._size_code = self.SZ_MAPPING.get(suffix, None)<EOL>if self._size_code is None:<EOL><INDENT>raise ValueError('<STR_LIT>'.format(self.SIZE, suffix))<EOL><DEDENT><DEDENT>
Set the code for a size operation.