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もっとも簡単なFlaskの作り方

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もっとも簡単なFlaskアプリの作り方です。
Webブラウザで http://localhost:3000/hello にアクセスするとjsonファイル(内容は{'result':'hello world!'})の保存ダイアログが表示されます。
※ とある方に「hello worldレベルの説明がほしい」と言われたので

flaskのインストール
pip install flask
hello.py
# -*- coding: utf-8 -*-
from flask import Flask, make_response, jsonify

# flask
app = Flask(__name__)

# rest api
@app.route('/hello', methods=['GET'])
def hello_world():
    return make_response(jsonify({'result':'hello world!'}))
    
# main
if __name__ == "__main__":
    app.run(host='localhost', port=3000)
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