flash flask routing

flash_routing.py

@application.route('/correlation/result/<security1>/<security2>/<start_date>/<end_date>')
def correlation_result(security1,security2,start_date,end_date):

    try:

        c = Correlation(security1, security2, start_date, end_date)

    except:

        if start_date > end_date:

            flash("Start Date can't be greater than End Date and min window is 7 days")
            return redirect(url_for('correlation'))

        else:
            flash("Please be sure to select both ticker inputs from the autocomplete first and then select dates")
            return redirect(url_for('correlation'))
     ### Code continues if no errors ###