Flask

@app.route('/search/<int:idno>', methods=['GET', 'POST']) #change here
def search(idno):
    results = []
    search_string = request.form['search']
    if request.form['search'] == '':
        qry = db_session.query(idno)
        results = qry.all()

    if not results:
        flash('ID not found !')
        return redirect('/')

    else:
        # display results
        return render_template('success.html', results=results)




<div class="search">
  <form method="POST"> # change here remove action
      <input type=text name=search value="{{ request.form.search}}"></br>
      <div class="actions"><input type=submit value="Search"></div>
  </form>
  </div>
  {% for message in get_flashed_messages() %}
  <div class=flash>
      {{ message }}
  </div>

  {% endfor%}

{% endblock%}