【python小白】 自学web.py遇到未知错误

Question

根据教程：
web.py 0.3 新手指南
一步一步走下来，写的代码

代码如下：

import web

urls = (
    '/','index'
)

class index:
    def GET(self):
        return "Hello, world!"

if __name__ == "__main__":
    app = web.application(urls, globals())
    app.run()

在根据教程运行，结果弹出以下错误：

Traceback (most recent call last):
  File "code.py", line 13, in <module>
    app.run()
  File "/anaconda3/lib/python3.7/site-packages/web/application.py", line 374, in run
    return wsgi.runwsgi(self.wsgifunc(*middleware))
  File "/anaconda3/lib/python3.7/site-packages/web/wsgi.py", line 66, in runwsgi
    return httpserver.runsimple(func, server_addr)
  File "/anaconda3/lib/python3.7/site-packages/web/httpserver.py", line 175, in runsimple
    print("http://%s:%d/" % server_address)
TypeError: not enough arguments for format string

不知道这个错误到底是啥意思？有大神可以帮忙解答一下不？

Answer 1

web.py启动方式请查看下面run函数源码注释，后面启动地址及端口号为非必填，默认8080

源码中，不提供参数默认使用的是8080端口