Checking if we are in a virutalenv for python

check_venv.py

#! /usr/local/bin/python3

import sys


def is_venv():
    return (hasattr(sys, 'real_prefix') or
            hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix)


if __name__ == "__main__":
    if is_venv():
        print("You are running in a virtual env")
    else:
        print("""
    Please create & activate a virtual env:


    virtualenv .venv && source .venv/bin/activate
        """)