brew update
brew upgrade python
# OU caso não esteja instalado
brew install python

pip3 install virtualenv

mkdir flask # cria a pasta
cd flask
virtualenv flask
flask/bin/python3 -m pip install flask

chmod a+x app.py
chmod a+x api.py

#!flask/bin/python
from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return "Olá mundo!"

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

./app.py

#!flask/bin/python
from flask import Flask, jsonify, abort

app = Flask(__name__)

tasks = [
    {
        'id': 1,
        'title': u'Buy groceries',
        'description': u'Milk, Cheese, Pizza, Fruit, Tylenol',
        'done': False
    },
    {
        'id': 2,
        'title': u'Learn Python',
        'description': u'Need to find a good Python tutorial on the web',
        'done': False
    }
]

@app.route('/todo/api/v1.0/tasks', methods=['GET'])
def get_tasks():
    return jsonify({'tasks': tasks})

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

$ brew install curl

$ curl -i http://localhost:5000/todo/api/v1.0/tasks

@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['GET'])
def get_task(task_id):
    task = [task for task in tasks if task['id'] == task_id]
    if len(task) == 0:
        abort(404)
    return jsonify({'task': task[0]})

from flask import make_response

@app.errorhandler(404)
def not_found(error):
    return make_response(jsonify({'error': 'Not found'}), 404)

from flask import request

@app.route('/todo/api/v1.0/tasks', methods=['POST'])
def create_task():
    if not request.json or not 'title' in request.json:
        abort(400)
    task = {
        'id': tasks[-1]['id'] + 1,
        'title': request.json['title'],
        'description': request.json.get('description', ""),
        'done': False
    }
    tasks.append(task)
    return jsonify({'task': task}), 201

$ curl -i -H "Content-Type: application/json" -X POST -d '{"title":"Ler um livro"}' http://localhost:5000/todo/api/v1.0/tasks

HTTP/1.0 201 CREATED
Content-Type: application/json
Content-Length: 106
Server: Werkzeug/0.14.1 Python/3.6.1
Date: Tue, 11 Dec 2018 13:36:23 GMT

{
  "task": {
    "description": "",
    "done": false,
    "id": 3,
    "title": "Ler um livro"
  }
}

$ curl -i http://localhost:5000/todo/api/v1.0/tasks

$ flask/bin/python3 -m pip install pandas

import pandas as pd

@app.route('/movies/api/v0.1/movies', methods=['GET'])
def get_movies():
    csv_file = pd.DataFrame(pd.read_csv("movies.csv", sep = ",", header = 0, index_col = False))
    json_file = csv_file.to_json(orient = "records", date_format = "epoch", double_precision = 10, force_ascii = True, date_unit = "ms", default_handler = None)
    response = app.response_class(
        response=json_file,
        status=200,
        mimetype='application/json'
    )
    return response