import os
import csv
from flask import Flask, render_template, request, redirect, url_for, send_from_directory, session
from werkzeug.utils import secure_filename
app = Flask(__name__)

UPLOAD_FOLDER = './uploads'
ALLOWED_EXTENSIONS = set(['csv'])
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['SECRET_KEY'] = os.urandom(24)

def allowed_file(filename):
    return '.' in filename and \
        filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS

@app.route('/')
def index():
    return render_template('csv.html')


@app.route('/show_csv', methods=['GET', 'POST'])
def show_csv():
    if request.method == 'POST':
        send_data = request.files['send_data']
        if send_data and allowed_file(send_data.filename):
            filename = secure_filename(send_data.filename)
            send_data.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            f = open('uploads/' + filename, 'r')
            f_reader = csv.reader(f)
            result = list(f_reader)

            return render_template('csv.html', result=result)


@app.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)

if __name__ == '__main__':
    app.debug = True
    app.run()

{% extends "base.html" %}
{% block content %}
<form method="post" action="{{ url_for('show_csv') }}" enctype="multipart/form-data">
  <input type="file" id="send_data" name="send_data">
  <input type="submit" value="Senden">
</form>
<div>
  {% if result %}
  <dl>
  {% for i in result %}
    <dt>{{ i[0] }}<dt>
    <dd>{{ i[1] }}</dd>
  {% endfor %}
  </dl>
  {% endif %}
</div>
{% endblock %}

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