Setting up a brand new Python Virtual Env

Python venv Setup

Step 1(Project context) : mkdir project-folder && cd project-folder
Step-2(Global site package) : pip install virtualenv
Step-3(create virtualenv with python version ) : virtualenv -p /usr/bin/python3.7 .venv
Step-4(activate .venv) : source .venv/bin/activate
Step-4(Local to .venv) : pip install pip-tools
Step-5(manual) : create requirements.in / dev-requirements.in

requirements.in
===============
psycopg2
sqlalchemy 


Step-6(Compile Spec files) :  pip-compile --generate-hashes requirements.in   

This generates a file as below

requirements.txt
================
#
# This file is autogenerated by pip-compile
# To update, run:
#
#    pip-compile --generate-hashes
#
psycopg2==2.8.2 \
    --hash=sha256:00cfecb3f3db6eb76dcc763e71777da56d12b6d61db6a2c6ccbbb0bff5421f8f \
    --hash=sha256:076501fc24ae13b2609ba2303d88d4db79072562f0b8cc87ec1667dedff99dc1 \
    --hash=sha256:4e2b34e4c0ddfeddf770d7df93e269700b080a4d2ec514fec668d71895f56782 \
    --hash=sha256:5cacf21b6f813c239f100ef78a4132056f93a5940219ec25d2ef833cbeb05588 \
    --hash=sha256:61f58e9ecb9e4dc7e30be56b562f8fc10ae3addcfcef51b588eed10a5a66100d \
    --hash=sha256:8954ff6e47247bdd134db602fcadfc21662835bd92ce0760f3842eacfeb6e0f3 \
    --hash=sha256:b6e8c854cdc623028e558a409b06ea2f16d13438335941c7765d0a42b5bedd33 \
    --hash=sha256:baca21c0f7344576346e260454d0007313ccca8c170684707a63946b27a56c8f \
    --hash=sha256:bb1735378770fb95dbe392d29e71405d45c8bdcfa064f916504833a92ab03c55 \
    --hash=sha256:de3d3c46c1ee18f996db42d1eb44cf1565cc9e38fb1dbd9b773ff6b3fa8035d7 \
    --hash=sha256:dee885602bb200bdcb1d30f6da6c7bb207360bc786d0a364fe1540dd14af0bab
sqlalchemy==1.3.3 \
    --hash=sha256:91c54ca8345008fceaec987e10924bf07dcab36c442925357e5a467b36a38319


Step-7(Sync local env form PyPi) : pip-sync dev-requirements.txt requirements.txt