This script will insert a cookie with a key value pair in your system .

set_cookie.py

#######################################################
#                                                     #
#   This script is a demo script which will           #
#   insert a cookie in your browser.                  #
#   Before executing this script please make sure     #
#   that Flask and Python is installed in your system.#
#######################################################

from flask import Flask
from flask import make_response
app=Flask(__name__)
@app.route("/")
def setcookie():
    response=make_response("Cookie Inserted")
    response.set_cookie('course','web_pentesting')
    return response
if __name__=="__main__":
    app.run(debug=True)