I want to Install opencv dnn module to python3 but when i run script it automatically got installed to python2.7

[8087482204]

I wanted opencv 4.1.1 to be installed on python3 but it got installed to python 2.7 how I can reinstall it to python3 or is there any command to make it use with python3.
Also there is preinstalled version of Opencv in python3 how i can remove it

[MinhDung0803]

I have complied successfully with python3 by followed these steps:

1. Uninstall Python2 out of your Jetson
   sudo apt purge -y python2.7-minimal

2. Replace default Python2 by Python3(and pip also)
   sudo ln -s /usr/bin/python3 /usr/bin/python
   sudo ln -s /usr/bin/pip3 /usr/bin/pip

3. Build opencv 4.4.0
   sudo ./build_opencv.sh

Result:

I hope this help :)

[sarvaatmak]

@MinhDung0803 @mdegans I did as you said and uninstalled python2 but then i run the script and observed that it again reinstalled python2 while ongoing process.
can you create separate scripts for python3 and python2 it might help a lot.
i am trying to install cv2 with your sctipt in jetpack 4.6 i think its installing version opencv 4.4 will update you the result i.e if successful or not and to clarify i am installing on jetson xavier nx .
thanks.

[mdegans]

The expected behavior is to build for both. I'll try to replicate when I get a chance.

@MinhDung0803

These commands here...

sudo ln -s /usr/bin/python3 /usr/bin/python
sudo ln -s /usr/bin/pip3 /usr/bin/pip

...might break a lot of things on Linux for Tegra because /usr/bin/python is usually python2 and apt needs to know when a python version changes. Try instead:

sudo update-alternatives --config python

To see what versions are available and switch. It will still likely break a lot of things, but hopefully fewer. Recent Ubuntu versions (and likely L4T) use python instead of python3, but only if you install a python-is-python3 package for it.

$ python
Command 'python' not found, did you mean:
  command 'python3' from deb python3
  command 'python' from deb python-is-python3