Solution
@app.route("/") # I think you have missed this.
# Set up Postgres database connection and cursor.
t_host = "PostgreSQL database host address" # either "localhost", a domain name, or an IP address.
t_port = "5432" # default postgres port
t_dbname = "database name"
t_user = "database user name"
t_pw = "password"
db_conn = psycopg2.connect(host=t_host, port=t_port, dbname=t_dbname, user=t_user, password=t_pw)
db_cursor = db_conn.cursor()
@app.route("/import_temp")
def import_temp():
@app.route("/")
@app.route("/import_temp")
def import_temp():
# Do something