Init.

app.py

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+from flask import Flask
+from flask_restful import Resource, Api, reqparse
+import pandas as pd
+import ast
+app = Flask(__name__)
+api = Api(app)

locations.csv

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+locationId,name,rating
+1,Café de Flore,4.0
+2,Café Tabac,4.6
+3,Rosslyn Coffee,4.8
+4,Three Wheels Coffee,4.6
+5,Roasting Plant Coffee,4.4
+6,Distrikt coffee,4.4
+7,Westberlin,4.4

users.csv

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+userId,name,city,locations
+a1b,Joe,Paris,"['0001', '0002', '0008']"
+a2c,Jenny,London,"['0003', '0004']"
+b1b,Jack,London,"['0003', '0005']"
+b2c,Jill,Berlin,"['0006', '0007']"