sudo pip install virtualenv (install virtual virtualenv library)

virtualenv -p /usr/bin/python3.6 venv (create a virtual env)

source venv/bin/activate (activate the env)

pip install requirement.txt (install dependencies)

PgMigrator.py is to migrate postgres tables and mongoMigrator is to migrate mongo collections. uncomment the necessary functions to execute

PostgresDiff and mongoDiff can be used to compare and produce difference of two databases.

You need to install postgresql-server-dev-X.Y for building a server-side extension or libpq-dev for building a client-side application

sudo apt-get install -y postgis postgresql-9.3-postgis-2.1 pip install psycopg2 or

sudo apt-get install libpq-dev python-dev pip install psycopg2

working -> sudo apt-get install libpq-dev python-dev pip install psycopg2

to exit virtualenv > deactivate

sudo apt-get install python3-pip

sudo pip3 install virtualenv 

virtualenv venv 

you can use any name insted of venv

virtualenv -p /usr/bin/python2.7 venv

source venv/bin/activate

source venv/bin/activate.fish

deactivate

virtualenv -p python3 myenv

python3 -m venv myenv