Hello there,
Thanks for your feedback! Today i launched Cloud Shell and my code was restored to the latest version. I've just checked the Google Cloud Status Tracker and there're some problems with Cloud Shell yesterday, may be it is the reason why.
By the way, everyday i lauch Cloud Shell and test my code. I use these command lines:
cd auto_tools/
virtualenv --python python3 ~/envs/auto_tools
source ~/envs/auto_tools/bin/activate
gcloud config set project MY_PROJECT_ID
python3 main.py
Everything is ok now and i'm very happy that i don't lost all my codes. Thanks for your supporting!