Results 2 issues of FulChou

hello, i get this error, when i run code "python main.py --env-name "PongNoFrameskip-v4" i don't know what happed, my env is: python3.6.3 Package Version ----------------- ------- atari-py 0.2.6 cached-property 1.5.2...

``` int a=5,b; b = (++a)+(++a); System.out.println(b); ``` 使用java验算了结果是13呀