The YDK-Py Vagrant sandbox now runs the latest version 0.5.4. If you want to use it and are a newcomer, clone the ydk-py-samples repository:
$ git clone https://github.com/CiscoDevNet/ydk-py-samples.git
That repository provides over 500 samples apps and includes the Vagrant file.
If you have used the sandbox in the past, upgrade your sandbox:
$ vagrant box update
To start you're sandbox, execute
$ vagrant up
Then connect to your sandbox using:
$ vagrant ssh
Remember, the samples and projects directory and shared between your sandbox and your host. Given that YDK-Py installation is now dramatically simpler, this sandbox may become less relevant over time. In the future, we expect sandbox users to manually upgrade the sandbox using the YDK-Py quick install instructions.
One additional detail to above steps is you need to have vagrant and virtual box installed and change directory to the same same directory as the vagrant file when you do vagrant up.