from flask_server import app as application
File"/home/my_project/my_server/flask_server.py", line 6, in module
  import cv2
f you're seeing an import error and don't know why, we have a
dedicated help page to help you debug: 
https://help.pythonanywhere.com/pages/DebuggingImportError/
It's weird since the app works fine when i launch it on bash using my virtual env like this  "python -i /var/www/myapp_pythonanywhere_com_wsgi.py ", I can also see the right paths printing sys.path. I obviously specified my virtual env path in the web tab section and reloaded it. I even added a sys.path.append(cv2_path) in the WSGI file of my web app, but it keeps giving this error. Any ideas?
ps. I had to compile my OpenCv library in my virtual env to use contrib modules
              
@giles sure go ahead, i appreciate your help!
@Artscorer still not working on my web app, lol.
my objective right now is to solve the cv2 import on my web app, because I think I can handle the rest of the debug hopefully.
              
Something weird happened: I double checked as @conrad suggested, and my virtual env wasn't actually working. And that's weird because typing "env" I checked that , idk how, some of my env variables were actually deleted, precisely "PYTHONPATH" and "LD_LIBRARY_PATH". I added them again and now it starts, tries to load my models and presents me a python console, even tho it should start the web app. Anyway i reloaded the web app and tried once again to connect to it via browser and the error log gives me the import cv2 error again. I'm not understanding what I did wrong, cause now in my virtualenv I can import cv2 without problems.
ps. I do know why it presents me with the python console after loading my models. Using bash console it actually doesn't start my web app because there is the 
if __name__ == '__main__':
do stuff to start the web app...
so I would say it works on my console, but not the hosted web app
[edit by admin: formatting]
              
Just for clarity, env isn't related to virtualenvs -- it's how you look at Bash environment variables.  (Perhaps that's something you're aware of, but I wanted to make sure that any other readers also understand.)
When you say that you can import cv2 in your virtualenv, could you give the exact steps that you're doing to confirm that?  I can see that you have two virtualenvs, one called cv2 (for Python 3.6) and one called opencv (for Python 2.7), and neither of them has cv2 installed.
              
Guys I solved the problem. It was my mistake, I needed to sym-link opencv cv2.so  bindings into my  virtual environment. Since i compiled and installed opencv manually I needed to link it manually too. Now everything works just fine. 
This is a good guide to install opencv manually if some of you are interested:
https://www.pyimagesearch.com/2018/05/28/ubuntu-18-04-how-to-install-opencv/
Also, tip for those who want to compile and install libraries using cmake on pythonanywhere, make sure that your CMAKE_INSTALL_PREFIX variable is set to a folder in /home/myproject because you don't have root privileges and it set on /usr/lib by default (i know lots of you already know this and probably have better solutions, but I struggled to understand this infos as a noob and it may be helpful to some). 
Btw thank you for your help, it was useful, GG!
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