Is it possible to execute multiple python project unit test suites with one driver given my repo structure?

Background

I have a repo for a new set of projects written in python. I have multi level folders set up to distinguish each tool when a developer checks out the repo. Something like the following:

repo
    project1
        __init__.py
        project1
            __init__.py
            code
        tests
            __init__.py
            test_something
    project2
        __init__.py
        project2
            __init__.py
            code
        tests
            __init__.py
            test_something

Problem A developer gave me a pytest regression test script that executes all project unit tests in a given directory, however given my project structure it is unable to run. The driver cannot import any of the modules so the regression script fails immediately on Module errors.

I tried updating the project level init files with

import os, sys

for relativePath in ["/", "/..", "/../*, "/../tests"]:
    fileLoc = os.path.dirname(os.path,realpath(os.path.abspath(__file__))) + relativePath
    if( True == os.path.exists(fileLoc) and ( fileLoc not in sys.path) ):
        sys.path.append(fileLoc)

but I don't believe that is going to be useful given the two folders per project.

Question

Is it possible to execute all unit tests at the "repo" level?

Would restructuring the repo be a better choice?