烧瓶“你好世界"不起作用 [英] flask 'hello world' not working

问题描述

我从他们的网站复制粘贴了烧瓶的"hello world"应用程序，并试图运行它.我在Chrome中收到一条错误消息，说

I copy pasted the flask's 'hello world' app from their website and am trying to run it. I get an error message in Chrome saying

Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

这是直接来自flasks网站的"hello world"应用程序

Here is the 'hello world' app straight from flasks website

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello World!'

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

我尝试过的事情:

-暂时禁用Avast！

-temporarily disabling Avast!

-禁用Windows防火墙

-disabling windows firewall

-确保已安装flask模块

-ensuring that the flask module is installed

实际上几天前就在工作...

This was working a couple days ago actually...

推荐答案

我不知道为什么，但是当我改变时

I don't know why but when I change

app.run()

到

app.run(port=4996)

它开始工作.不知道为什么默认端口会引发错误.哦，好吧.

it starts working. No idea why the default port is throwing an error. Oh well.

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