how to use virtual environment in jupyter notebook code example

Example 1: jupyter from virtualenv

$ python -m venv projectname
$ source projectname/bin/activate
(venv) $ pip install ipykernel
(venv) $ ipython kernel install --user --name=projectname

Example 2: how to add virtual environment in jupyter notebook

python -m ipykernel install --user --name=<my_env_name>

Example 3: jupyter notebook in environment

python -m ipykernel install --user --name=firstEnv