Cython module not found when called by other python files

Question

I am using cpython to detect all cameras attached to the computer, and return the device information. I have successfully run the program in below by simply calling its file name in terminal. ( device is the C++ file I generated through setup.py):

import device

def get_device_dict():
    print("hello")
    res = {}

    device_list = device.getDeviceList()
    index = 0

    for name in device_list:
        res[index] = name
        index += 1
    return res

get_device_dict()

However, when I try to call the function from another file (camera.py based on the directory structure shown in below) by importing it, problem occurs as it says there is a failure to import the C++ generated package.

ModuleNotFoundError: No module named 'device'

Here is my directory:

Answer 1

Just made some attempts and find it is running properly from outer directory. The problem is about me running the django framework. The django framework cannot detect the cython module.