How to install Virtual environment (virtualenv) and requirements.txt in python3
Install virtual environment and use requirements.txt Step 1. 	 Install python 3 	 sudo apt-get update 	 sudo apt-get install python3.6 	 you can check python version 	 python3 -V Step 2 	 Now install  	 sudo apt install python3-pip 	 Please check pip version 	 pip3 -V   	 it's should be >= pip 20.0.0 Step 3 	 Install virtualenv 	 pip3 install virtualenv Step 4 	 Now select a directory where you want to setup virtualenv Like 	 cd /directory/path Step 5 	 In that directory setup virtualenv with python3 	 virtualenv -p python3 ./dir_name 	 it will create a dir_name folder (dir), You can change it whatever you like (dir_name you should write anything whatever you like) Step 6 	 Now active it  	 source dir_name/bin/activate 	 now you console look like this 	 (dir_name) computer$ 	 if you write down "python" and  then enter, your python3 will be run  Step 7 	 pip3 install install-requires 	 Now we have 2 ways to create requirements.txt 	 (i) install any packag...