Import and python source file in folders -

i have troubles understanding how python import works.

i forked this repository , going play having troubles understanding how python import works file in directories.

the directory structure following:

fitbit/     __init__.py     gather_keys_cli.py     api.py     exceptions.py     utils.py 

as preliminary step need run gather_keys_cli.py. depends on api.py, in turn depends on exceptions.py.

if try run python interpreter works expected. if try run command line (as suggested in documentation) have obtain following exception.

$./fitbit/gather_keys_cli.py key secret  traceback (most recent call last):   file "./fitbit/gather_keys_cli.py", line 34, in <module>     api import fitbitoauthclient   file "/users/mariosangiorgio/fitbithacks/python-fitbit/fitbit/api.py", line 9, in <module> fitbit.exceptions import (badresponse, deleteerror, httpbadrequest, importerror: no module named fitbit.exceptions 

my understanding when invoke command line base path set folder containing it. @ point, scripts correctly imports oauth client because uses instruction from api import fitbitoauthclient, not contain reference fitbit directory.

on opposite, api.py uses instruction import exceptions from fitbit.exceptions import (list_of_classes). instruction contains reference fitbit directory , hence got error.

i not familiar python i'd understand pythonic way solve issue. have feeling there wrong going on , found workaround moving gather_keys_cli.py , changing api import import fitbit.api. works not sure right way solve issue i'm experiencing.