dict = {"k1":"v1","k2":"v2","k3":v3"}现有dict2 = {"k1":"v11","a":"b"},通过一行操作使dict2 = {"k1":"v1","k2":"v2","k3":"v3","a":"b"}

可以使用`update()`方法将dict2合并到dict中，实现一行操作的需求。具体操作如下：

dict = {"k1":"v1","k2":"v2","k3":"v3"}
dict2 = {"k1":"v11","a":"b"}
dict.update(dict2)

执行以上代码后，dict2的内容将被合并到dict中，得到`{"k1":"v1","k2":"v2","k3":"v3","a":"b"}`。