Flask run in Jupyter Notebook

flask-in-jupyter-notebook-demo.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting run.py\n"
     ]
    }
   ],
   "source": [
    "%%writefile run.py\n",
    "from flask import Flask\n",
    "\n",
    "app = Flask(__name__)\n",
    "\n",
    "@app.route(\"/\")\n",
    "def demo():\n",
    "    return \"Hello, word!\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<subprocess.Popen at 0x7fffec19fb70>"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import subprocess as sp\n",
    "\n",
    "# 启动子进程执行 Flask app\n",
    "server = sp.Popen(\"FLASK_APP=run.py flask run\", shell=True)\n",
    "server"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "b'Hello, word!'"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import requests\n",
    "\n",
    "requests.get(url=\"http://127.0.0.1:5000\").content"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "server.terminate() # 结束子进程，关闭端口占用"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.5"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}

get 时总是报错怎么办？
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=5000): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x000001F2DAE51910>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。'))

试过搜到的方案：
proxies = { "http": None, "https": None}
os.environ['NO_PROXY'] = 'http://127.0.0.1:5000'
session = requests.Session()
session.trust_env = False
session.get(url="http://127.0.0.1:5000", proxies=proxies).content

还是未解决报错