Flask的蓝图为啥无法启用

from flask import Flask,Blueprint,url_for

app = Flask(__name__,template_folder='./')
admin = Blueprint('admin',__name__)
@admin.route('/')
def admin_home():
    return '<p>admin_home</p>'

@app.route('/')
def index():
    return '<p>12138</p>'
#admin = Blueprint('蓝图', __name__, static_folder='static')
if __name__ == '__main__':
    app.register_blueprint(admin)
    app.run(host='127.0.0.1',port=8000)

我是这样写道，为什么我打开127.0.0.1:8000/admin不行呢，这样直接使用注册一个蓝图不行么

使用url_prefix='/child'，设置前缀
admin = Blueprint('admin',__name__， url_prefix='/admin')