add shellscript helper to install all python dependencies of the project (local, test, and production dependencies)

{{cookiecutter.repo_name}}/install_python_dependencies.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+pip --version >/dev/null 2>&1 || { 
+    echo >&2 -e "\npip is required but it's not installed."
+    echo >&2 -e "You can install it by running the following command:\n"
+    echo >&2 "wget https://bootstrap.pypa.io/get-pip.py; chmod +x get-pip.py; sudo ./get-pip.py"
+    echo >&2 -e "\n"
+    echo >&2 -e "\nFor more information, see pip documentation: https://pip.pypa.io/en/latest/"
+    exit 1;
+}
+
+virtualenv --version >/dev/null 2>&1 || { 
+    echo >&2 -e "\nvirtualenv is required but it's not installed."
+    echo >&2 -e "You can install it by running the following command:\n"
+    echo >&2 "sudo pip install virtualenv"
+    echo >&2 -e "\n"
+    echo >&2 -e "\nFor more information, see virtualenv documentation: https://virtualenv.pypa.io/en/latest/"
+    exit 1;
+}
+
+if [ -z "$VIRTUAL_ENV" ]; then
+    echo >&2 -e "\nYou need activate a virtualenv first"
+    echo >&2 -e 'If you do not have a virtualenv created, run the following command to create and automatically activate a new virtualenv named "venv" on current folder:\n'
+    echo >&2 -e "virtualenv venv"
+    echo >&2 -e "\nTo leave/disable the currently active virtualenv, run the following command:\n"
+    echo >&2  "deactivate"
+    echo >&2 -e "\nTo activate the virtualenv again, run the following command:\n"
+    echo >&2  "source venv/bin/activate"
+    echo >&2 -e "\nFor more information, see virtualenv documentation: https://virtualenv.pypa.io/en/latest/"
+    echo >&2 -e "\n"
+    exit 1;
+else
+
+    pip install -r requirements/local.txt
+    pip install -r requirements/test.txt
+    pip install -r requirements.txt
+fi
+
+
+