Amazon Product APIで売り上げ実績が30日ないとエラーになるようになってた

以下のプログラムで何度やってもエラーになってた。 どうやら、2019年1月から、仕様変更があり、 売り上げ実績が30日ないとエラーを返すようになったらしい。

使いづらくなったなあ。

import os
import time

from amazon.api import AmazonAPI # pip install python-amazon-simple-product-api

AMAZON_ACCESS_KEY = os.environ['AMAZON_ACCESS_KEY']
AMAZON_SECRET_KEY = os.environ['AMAZON_SECRET_KEY']
AMAZON_ASSOCIATE_TAG = os.environ['AMAZON_ASSOCIATE_TAG']

amazon = AmazonAPI(AMAZON_ACCESS_KEY, AMAZON_SECRET_KEY, AMAZON_ASSOCIATE_TAG, Region='JP')
products = amazon.search(Keyword='kindle', SearchIndex='All')

for product in products:
    print(product.title)
    print(product.offer_url)
    price, currency = product.price_and_currency
    print(price, currency)

エラー

Traceback (most recent call last):
  File "5.6_amazon_product_search.py", line 13, in <module>
    for product in products:
  File "/Users/qhssk842/PycharmProjects/python_clowling/scraping/lib/python3.7/site-packages/amazon/api.py", line 544, in __iter__
    for page in self.iterate_pages():
  File "/Users/qhssk842/PycharmProjects/python_clowling/scraping/lib/python3.7/site-packages/amazon/api.py", line 561, in iterate_pages
    yield self._query(ItemPage=self.current_page, **self.kwargs)
  File "/Users/qhssk842/PycharmProjects/python_clowling/scraping/lib/python3.7/site-packages/amazon/api.py", line 573, in _query
    response = self.api.ItemSearch(ResponseGroup=ResponseGroup, **kwargs)
  File "/Users/qhssk842/PycharmProjects/python_clowling/scraping/lib/python3.7/site-packages/bottlenose/api.py", line 274, in __call__
    {'api_url': api_url, 'cache_url': cache_url})
  File "/Users/qhssk842/PycharmProjects/python_clowling/scraping/lib/python3.7/site-packages/bottlenose/api.py", line 235, in _call_api
    return urllib2.urlopen(api_request, timeout=self.Timeout)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 503: Service Unavailable
ERROR: exit status 1

自身で売り上げ発生させればいいじゃんと思って、自分でつくったリンクで商品を購入してみたけど、ダメだね。。。 うーん。どうしたらいいかなぁ。。。。