Local prototyping with Flask¶
Flask pacakge allows to simply run a Python script as a webservice. This can be easily done as illustrated below.
Setup instructions¶
- Download Python 3.7.2 (or another Python version >= 3.6) from https://www.python.org/downloads/ and install it
- Install required packages to create a web-service from your Python code
pip install flask
pip install flask_restful
pip install flask_cors
- Install commonly used packages for scientific computing :
pip install numpy
pip install scipy
If you are behind a proxy, you might need to specify it. Example :
pip --proxy our-proxy:8082 install numpy
Simple template¶
Download this simple template and save it to template-python-ws.py file.
from flask import Flask, request
from flask_restful import Resource, Api
from flask_cors import CORS
import json
import numpy as np
app = Flask(__name__)
CORS(app)
api = Api(app)
class Test(Resource):
def post(self):
input = json.loads(request.data)
A = input["A"]
B = input["B"]
sum = np.add(A,B)
product = np.multiply(A,B)
output = {
"sum": sum.tolist(),
"product" : product.tolist()
}
return output
api.add_resource(Test, '/basicVect')
if __name__ == '__main__':
app.run(debug=True)
then run:
python template-python-ws.py
your server should be listening on localhost, port 5000.
Chalk'it project¶
Open the following simple Chalk'it project to test the python web-service.