Very simple TinyWebDB-compliant server app for use with App Inventor

server.py

import json
from flask import Flask, request

app = Flask(__name__)

db = {}


@app.route('/')
def hello_world():
    return repr(db)


@app.route('/tinywebdb/getvalue', methods=['GET', 'POST'])
def get_value():
    tag = request.values.get('tag')
    value = db.get(tag, '')
    return json.dumps(['VALUE', tag, value])


@app.route('/tinywebdb/storeavalue', methods=['GET', 'POST'])
def store_value():
    values = request.values
    tag = values.get('tag')
    value = values.get('value')
    db[tag] = value
    print db

    return json.dumps(['STORED', tag, value])

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')