上QQ阅读APP看书，第一时间看更新
Time for action — updating the rockets
Add a call to the function UpdateRockets, inside the UpdateGame method.
Method UpdateGame() UpdateLaunchers() UpdateRockets() Return True
What just happened?
That was quick, right? We have a class for our rockets now. We can create them easily and update them through a simple call of a function. Once they reach their target, they destroy themselves.