Restriction: this snap version works with a python in the snap environment. Therefore, we cannot use the python in /bin and modules in$PYTHONPATH. When you want to use opy with the modules you installed, please install opy from GitHub (https://github.com/ryuichiueda/opy) with the commands below. I would appreciate it if you could click the star on the repository page.
$ git clone https://github.com/ryuichiueda/opy.git
$ cd opy
$ sudo make install
For versions of Ubuntu between 14.04 LTS (Trusty Tahr) and 15.10 (Wily Werewolf), as well as Ubuntu flavours that don’t include snap by default, snap can be installed from the Ubuntu Software Centre by searching for snapd.
Alternatively, snapd can be installed from the command line:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.