from flask import Flask
from flask import g
from flask import render_template
from flask import request
from flask import Response
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'top'
@app.route('/hello')
@app.route('/hello/<username>')
def hello_world2(username=None):
return render_template('hello.html', username=username)
def main():
app.debug = True
app.run(host='127.0.0.1', port=5000)
if __name__ == '__main__':
main()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Hello</title>
</head>
<body>
{% if username %}
Hello {{ username }}
{% else %}
Hello
{% endif %}
</body>
</html>
