Function import_or_getattr

include/pybind11/detail/native_enum_data.h:122–183

}

inline object import_or_getattr(const std::string &fully_qualified_name,
                                const std::string &append_to_exception_message) {
    std::istringstream stream(fully_qualified_name);
    std::string part;

    if (!std::getline(stream, part, '.') || part.empty()) {
        std::string msg = "Invalid fully-qualified name `";
        msg += fully_qualified_name;
        msg += "`";
        msg += append_to_exception_message;
        throw value_error(msg);
    }

    auto curr_scope = reinterpret_steal<object>(PyImport_ImportModule(part.c_str()));
    if (!curr_scope) {
        std::string msg = "Failed to import top-level module `";
        msg += part;
        msg += "`";
        msg += append_to_exception_message;
        raise_from(PyExc_ImportError, msg.c_str());
        throw error_already_set();
    }

    // Now recursively getattr or import remaining parts
    std::string curr_path = part;
    while (std::getline(stream, part, '.')) {
        if (part.empty()) {
            std::string msg = "Invalid fully-qualified name `";
            msg += fully_qualified_name;
            msg += "`";
            msg += append_to_exception_message;
            throw value_error(msg);
        }
        std::string next_path = curr_path;
        next_path += ".";
        next_path += part;
        auto next_scope
            = reinterpret_steal<object>(PyObject_GetAttrString(curr_scope.ptr(), part.c_str()));
        if (!next_scope) {
            error_fetch_and_normalize stored_getattr_error("getattr");
            // Try importing the next level
            next_scope = reinterpret_steal<object>(PyImport_ImportModule(next_path.c_str()));
            if (!next_scope) {
                error_fetch_and_normalize stored_import_error("import");
                std::string msg = "Failed to import or getattr `";
                msg += part;
                msg += "` from `";
                msg += curr_path;
                msg += "`";
                msg += append_to_exception_message;
                msg += "\n-------- getattr exception --------\n";
                msg += stored_getattr_error.error_string();
                msg += "\n-------- import exception --------\n";
                msg += stored_import_error.error_string();
                throw import_error(msg.c_str());
            }
        }
        curr_scope = next_scope;