Python ImportError when trying to import a module in different path

Question

I'm new in python programming and i've got this error:

Traceback (most recent call last): File "ultrasonicExample.py", line 7, in ? from concretesensor.hcsr04 import HCSR04 ImportError: No module named concretesensor.hcsr04

here's my app structure:

sensorPy/ src/ abstractclass/ __init__.py ultrasonicSensor.py ... concretesensor/ __init__.py hcsr04.py ... examples/ __init__.py ultrasonicExample.py

my __init__.py under abstractclass:

from abstractclass.ultrasonicSensor import UltrasonicSensor

my __init__.py under concretesensor:

from concretesensor.hcsr04 import HCSR04

I also cheched my sys.path:

>>> import sys >>> from pprint import pprint as p >>> p(sys.path) ['', ... '/home/pi/Documents/sensorPy/src', ... ] >>>

im ultrasonicExample.py I do:

from concretesensor.hcsr04 import HCSR04

in hcsr04.py I do:

from abstractclass.ultrasonicSensor import UltrasonicSensor

Does anyone know what am I doing wrong?

Your __init__.pys should just contain e.g. from ultrasonicSensor import UltrasonicSensor. — jonrsharpe
– jonrsharpe, Commented Mar 3, 2015 at 13:47
Do export PYTHONPATH='/home/pi/Documents/sensorPy/src' and then run your code again. — dopstar
– dopstar, Commented Mar 3, 2015 at 14:06

Michael Kazarian · Accepted Answer · 2015-03-03 14:56:46Z

1

Your concretesensor must in PYTHONPATH variable. Alternate (and better) way is add your path to sys.path:

import sys sys.path.append("/my/path")

Try insert relative path to sys.path (read about)

sys.path.append("../..") #root of application

and write __init__.py in root application directory.

edited Mar 3, 2015 at 14:56

answered Mar 3, 2015 at 14:49

Michael Kazarian

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2 Comments

Júnior Mascarenhas Over a year ago

Thanks Michael, I'll try this when I come home. Just some more doubts: should I put code sys.path.append("../..") inside my init.py (under concretesensor) ? I thought It was not necessary, since when I do : pprint(sys.path) it returns me '/home/pi/Documents/sensorPy/src'. and when you say "write init.py in root application directory." it means under src folder or under sensorPy folder?

Michael Kazarian Over a year ago

Situate your code to PYTHONPATH e.g. site-package and use it everywhere without sys.path.append.

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