Setting Python path / Environment variables in Docker

Hi there ,

I am using FEniCS in docker container which is running in windows 10 operating system. I want to use a package through import but when i run my scripts , i get the error

Importerror : No module named…

i have searched for possible solutions, the documentation of package i want to use and it says that i should use
export PYTHONPATH=<path/to/package>:$PYTHONPATH
When i adopt this way , i still get the error

Can anyone very kindly guide me how to set pythonpath for my desired package while using fenics in docker container.

I would be thankful
Regards,
Ovais