Not able to set up a virtual environment with venv

[snippsat]

This is what I did but I was getting error, so this post.

Have you build Python: 3.7.4 yourself?
A common mistake is do not include all build tool.
As mention bye bowlofred python3.7-venv.
Try:

apt-get update
apt-get install python3.7-dev python3.7-venv

I use pyenv as i have tutorial about here pyenv Simple Python Version Management.
Look at point .1 there you see all build needed before build yourself or use pyenv to do this.