from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
    user = request.form.get('user', 'Flask')
    return render_template('index.html', user=user)
@app.route('/hello/<name>')
    def hello(name=None):
    return render_template('hello.html',name=name)

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')

vim templates/index.html
<html>
<title>Flask - Vfast</title>

<body>
    <h1>Hello, {{ user|title }}!</h1></br>
    <form method='POST'>
        <input type='text', name='user'>
        <input type='submit', name='submit'>
    </form>
</body>
</html>
vim templates/hello.html
<!doctype html>
<title>Hello from Flask</title>
{% if name %}
  <h1>Hello {{ name }}!</h1>
{% else %}
  <h1>Hello World!</h1>
{% endif %}

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