HTTP error 404

[snippsat]

It also better to always use Requests
If get xml back also need to use parser eg BeautifulSoup.

import requests
from bs4 import BeautifulSoup

fmt = 'xml'
zn = '1740064'
url = f'https://api.aoikujira.com/zip/zip.php?fmt={fmt}&zn={zn}'
response = requests.get(url).content
soup = BeautifulSoup(response, 'lxml')

Example usage:

>>> [i for i in soup.find_all('result')]
[<result name="api.aoikujira.com/zip"></result>,
 <result version="1.00"></result>,
 <result request_zip_num="1740064"></result>,
 <result result_code="1"></result>,
 <result database="2018-07-30"></result>]

>>> att = soup.find('value').attrs
>>> att
{'ken_kana': 'トウキョウト'}
>>> att['ken_kana']
'トウキョウト'

Using fmt=json will Requests(encode json()) and give back a Python dictionary.

import requests

fmt = 'json'
zn = '1740064'
url = f'https://api.aoikujira.com/zip/zip.php?fmt={fmt}&zn={zn}'
response = requests.get(url).json()

Example usage:

>>> response
{'API_URL': 'http://api.aoikujira.com/zip/zip.php',
 'address': '中台',
 'address_kana': 'ナカダイ',
 'city': '板橋区',
 'city_kana': 'イタバシク',
 'database': '2018-07-30',
 'ken_kana': 'トウキョウト',
 'result': '東京都板橋区中台',
 'result_code': 1,
 'state': '東京都',
 'version': '1.01'}

# Call is simple as it's a dictionary 
>>> response['ken_kana']
'トウキョウト'