Python3 获取异常的信息和traceback（实现类似PyErr_Print功能）

void fetch_error(){PyObject *type = NULL, *value = NULL, *traceback = NULL;PyErr_Fetch(&type, &value, &traceback);if (type){std::cout << PyExceptionClass_Name(type) << ": ";}if (value){PyObject *line = PyObject_Str(value);if (line && (PyUnicode_Check(line)))std::cout << PyUnicode_1BYTE_DATA(line);}std::cout << std::endl;if (traceback){for (PyTracebackObject *tb = (PyTracebackObject *)traceback;NULL != tb;tb = tb->tb_next){PyObject *line = PyUnicode_FromFormat("  File \"%U\", line %d, in %U\n",tb->tb_frame->f_code->co_filename,tb->tb_lineno,tb->tb_frame->f_code->co_name);std::cout<< PyUnicode_1BYTE_DATA(line)<<std::endl;}}}