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x = np.arange(3000)
vet = np.vectorize(elo2tier)
y = vet(x)

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https://docs.djangoproject.com/en/2.1/topics/db/optimization/

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def f1():
    print('play_wav')
    play_wav(fn)

def f2():
    print('post_to_rpi_api')
    post_to_rpi_api(signals)

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import pdb; pdb.set_trace()

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iptables

arp -a

ifconfig

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:%!python -m json.tool

---

reference: https://pascalprecht.github.io/posts/pretty-print-json-in-vim/

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import cgi
import os

import oauth2 as oauth
from django.conf import settings
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response

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mkdir try-puppeteer
cd try-puppeteer
npm i --save puppeteer

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$ nkf -Lu -w --overwrite *

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<button onclick="book()">図書</button>
<button onclick="mgzn()">雑誌</button>

<h2>図書</h2>
<div id="book" class="red-card">
  <p>
    Book book book.
  </p>
</div>