I have issue with importing packages
the file has just one line I.e, import numpy
So when I execute python filename.py I am getting ModuleNotFoundError whereas when I run the same with python3 filename.py it excutes without any errors.
All the versions that I have are 3.9 and above
As we mentioned in the comments, your default python is 3.9 and python3 as 3.11
The module error means that for one version you installed the packages, but for the other, you did not. You can figure this out with which python and which python3.
I recommend using environments for different projects that vary in libraries or python versions.
With venvs,create a venv with the python version installed you want.
python3.11 -m venv myenv
source myenv/bin/activate
Sourcing it, will show you in the console (myenv) at the beginning, meaning you are in that venv. if you install packages, they will be installed in this environment.
Similarly with anaconda:
conda create -n mycondaenv python=3.11.6
conda activate mycondaenv
To install packages you can install them with conda or pip if those are not available:
conda install numpy
pip install numpy
If you don't wont neither of these options, you can change the default version of python to use editing the .bashrc file:
alias python='python3.11'
And check
source ~/.bashrc
python --version