how to write invoke commands that reach other folders

inv_pylib_build.py

@task
def find():
    with cd('../../pylib/gh_hazardous_sol/'):
        print('finding tasks')
        res = check_output(['/opt/py27env/bin/invoke', '-l'])
        print('results = {}'.format(res))
        if 'build'  in res:
            print('we got build command')
            # currently all build code is common across all pylibs, through pylib/tasks.py.
            # folders like gh_hazardous_sol simply call pylib/tasks.py->build function if it exists
            # With this code, it will have to be the other way around.
            #   if the individual folder has got it's own build function, then pylib/tasks.py->build should call that
            run('/opt/py27env/bin/invoke build')