python3 + virtualenv + ubuntu

[solomem]

# Step 1: Update your repositories
sudo apt-get update

# Step 2: Install pip for Python 3
sudo apt-get install build-essential libssl-dev libffi-dev python-dev
sudo apt install python3-pip

# Step 3: Use pip to install virtualenv
sudo pip3 install virtualenv 
# Step 4: Launch your Python 3 virtual environment, here the name of my virtual environment will be env3
virtualenv -p python3 env3

--------alternative----------
# Step 3: alternative
sudo apt-get install python3.7-venv
# Step 4: Launch your Python 3 virtual environment, here the name of my virtual environment will be env3
python3.7 -m venv .venv
-------------------------------------------

# Step 5: Activate your new Python 3 environment. There are two ways to do this
. env3/bin/activate # or source env3/bin/activate which does exactly the same thing

# you can make sure you are now working with Python 3
python -- version
# this command will show you what is going on: the python executable you are using is now located inside your virtualenv repository
which python 

# Step 6: code your stuff

# Step 7: done? leave the virtual environment
deactivate

# Step 8: remove the vm
rm -r venv/

[solomem]

downgrade python

sudo apt-get install software-properties-common
sudo apt-get update
sudo apt-get install python3-distutils
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.8
or 
sudo apt install python3.7-distutils

[solomem]

pip install azureml-automl-dnn-vision==1.46.0

[solomem]

fatal error: Python.h: No such file or directory

For Python 3.7 and Ubuntu in particular, I needed

sudo apt install libpython3.7-dev

. I think at some point names were changed from pythonm.n-dev to this.

for Python 3.6, 3.8 through 3.10 (and counting…) similarly:

sudo apt install libpython3.6-dev 
sudo apt install libpython3.8-dev 
sudo apt install libpython3.9-dev
sudo apt install libpython3.10-dev