sampleFlask.py

from flask import Flask


app = Flask(__name__)

sample_list = list(i for i in range(9))

def runner():
    while True:
        for item in sample_list:
            yield item


runner_instance = runner()


@app.route('/')
def index():
    next_item = next(runner_instance)

    return dict(next_item=next_item)


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