Import python package in the module

Question

I am beginner in Python. I am using set python libraries and I want to take the part of my code in .py module. Where should I write "import" of the set of libraries, in the module, or in main file? If I don't write it in the module, program doesn't work.

#mainfile.py
import cv2
import faceResearch
faceResearch.mn()

#faceResearch.py
import cv2
def mn():
    image = cv2.imread("Smiling/3--1873301-Smiling woman looking at camera.jpg")
    cv2.imshow("im", image)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

so, in which file should I write "import cv2"? in mainfile? in file of the module? or in both?

Please post some code that you have tried. It's unclear exactly what your question is asking — thaavik, Aug 07 '17 at 15:49
Why do you want to separate `mainfile.py` and `faceResearch.py`? Both are technically modules, and if all you want to do is execute the code in `faceResearch.py` you should get rid of `mainfile.py` and run `faceResearch.py` directly. — apteryx, Aug 07 '17 at 16:06
It is only excample, I will have classes and methods in faceResearch.py — Danila Manturov, Aug 07 '17 at 16:11

score 1 · Accepted Answer · answered Aug 07 '17 at 16:05

1

You should keep import cv2 in your module (faceResearch.py ?) not in main.py. With that all others scripts importing your module will automatically import cv2 ; if cv2 is installed. You can check if cv2 is installed, and if not display an error message : link

answered Aug 07 '17 at 16:05

Taknok

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Thank you) I Should I use special file for imports and add in in each module? Because I will have much of libraries, not only cv2. – Danila Manturov Aug 07 '17 at 16:09
To summarize : each time you wrote `cv2` in a file, put `import cv2` in this file. – Taknok Aug 07 '17 at 16:13
@ДанилаМантуров if this solves your issue, pls pass the post as resolved, else ask for precision. – Taknok Aug 07 '17 at 19:21

Import python package in the module

1 Answers1