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--- PYTHON

#INSTALLING PYTHON


#OPENBSD INSTALL################
# pkg_add python
quirks-2.304 signed on 2019-06-02T15:04:33Z
Ambiguous: choose package for python
a       0: <None>
	1: python-2.7.13p0
	2: python-3.4.5p2
	3: python-3.5.2p2
	4: python-3.8
	Your choice: 4

if error like thism when launching python:
# python
ksh: python: not found

create a link like below to fix it.
#TO LAUNCH PYTHON 3.8 with python in cli
cd /usr/local/bin/
ln -s python3.8 python



#OPENBSD INSTALL PIP3
pkg_add py3-pip

#OPENBSD INSTALL VIRTUALENV
doas pkg_add py3-virtualenv


#Python virtual environment
python3 -mvenv /path/to/venv  # to create
 . /path/to/venv/bin/activate  # to use



--UBUNTU

#install pip
sudo apt-get install python3-pip

#install virtualenv
sudo pip3 install virtualenv

#build new virtualenv
$   cd $YOUR_PROJECT_DIRECTORY
$   virtualenv .venv
note: .venv or any $NAME for your virtualenv

#to activate your virtualev
source .venv/bin/activate

#to deactivate your virtualev
deactivate


install new packages
pip install <some-package>


---INSTALL JUPYTER NOTEBOOK
pip install notebook

#run jupyter notebook
jupyter notebook


================
==============
$ pip install virtualenv
If you are using Python 3, then you should already have the venv module from the standard library installed.


Start by making a new directory to work with:
$ mkdir python-virtual-environments && cd python-virtual-environments


Create a new virtual environment inside the directory:
# Python 2:
$ virtualenv env

# Python 3
$ python3 -m venv env


 

to activate it:
$ source env/bin/activate
(env) $



to deactivate it
(env) $ deactivate
$

=======================================
UBUNTU INSTALL

sudo apt install python3-venv

python3 -m venv my-project-env
$ source my-project-env/bin/activate
(my-project-env) $


pip install requests

nano testing.py

import requests

r = requests.get('http://httpbin.org/get')  
print(r.headers)