paapi5_python_sdkのsample_get_items_api.pyでamazonの商品情報を取得したい

Amazon AffiliateのAPIを実行する事を考えております。

##概要
サンプルプログラムを以下よりダウンロードし、SAMPLEコードと以下の箇所変更して実行しております。（ローカル環境で一回のみ）
https://webservices.amazon.com/paapi5/documentation/quick-start/using-sdk.html

python
1access_key = "hogehogege"
2secret_key = "hogehoge"
3partner_tag = "hoge"
4host = "webservices.amazon.co.jp"
5region = "us-west-2"
6marketplace="www.amazon.co.jp"

ですが、実行後に、以下のエラーが生じてしまいます。認証情報等は良さそうなのですが、リクエスト数が多すぎると言われても、一度しかしていないので、原因が不明です。。。

Error calling PA-API 5.0!
Status code: 429
Errors : {"__type":"com.amazon.paapi5#TooManyRequestsException","Errors":[{"Code":"TooManyRequests","Message":"The request was denied due to request throttling. Please verify the number of requests made per second to the Amazon Product Advertising API."}]}
Request ID: ef46350f-a370-409a-b416-311e39175549

##知りたい事
原因が不明のため、どなたか解決につながるヒントをいただけないでしょうか？

##コード

python
1# -*- coding: utf-8 -*-
2
3"""
4 Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5
6 Licensed under the Apache License, Version 2.0 (the "License").
7 You may not use this file except in compliance with the License.
8 A copy of the License is located at
9
10     http://www.apache.org/licenses/LICENSE-2.0
11
12 or in the "license" file accompanying this file. This file is distributed
13 on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
14 express or implied. See the License for the specific language governing
15 permissions and limitations under the License.
16"""
17
18"""
19 ProductAdvertisingAPI
20 
21 https://webservices.amazon.com/paapi5/documentation/index.html
22 
23"""
24
25"""
26This sample code snippet is for ProductAdvertisingAPI 5.0's GetItems API
27
28For more details, refer:
29https://webservices.amazon.com/paapi5/documentation/get-items.html
30
31"""
32
33from paapi5_python_sdk.api.default_api import DefaultApi
34from paapi5_python_sdk.condition import Condition
35from paapi5_python_sdk.get_items_request import GetItemsRequest
36from paapi5_python_sdk.get_items_resource import GetItemsResource
37from paapi5_python_sdk.partner_type import PartnerType
38from paapi5_python_sdk.rest import ApiException
39
40
41def parse_response(item_response_list):
42    """
43    The function parses GetItemsResponse and creates a dict of ASIN to Item object
44    :param item_response_list: List of Items in GetItemsResponse
45    :return: Dict of ASIN to Item object
46    """
47    mapped_response = {}
48    for item in item_response_list:
49        mapped_response[item.asin] = item
50    return mapped_response
51
52
53def get_items():
54    """ Following are your credentials """
55    """ Please add your access key here """
56    access_key = "hoge"
57
58    """ Please add your secret key here """
59    secret_key = "hoge"
60
61    """ Please add your partner tag (store/tracking id) here """
62    partner_tag = "hoge"
63
64    """ PAAPI host and region to which you want to send request """
65    """ For more details refer: https://webservices.amazon.com/paapi5/documentation/common-request-parameters.html#host-and-region"""
66    host = "webservices.amazon.co.jp"
67    region = "us-west-2"
68
69    """ API declaration """
70    default_api = DefaultApi(
71        access_key=access_key, secret_key=secret_key, host=host, region=region
72    )
73
74    """ Request initialization"""
75
76    """ Choose item id(s) """
77    item_ids = ["059035342X", "B00X4WHP5E", "B00ZV9RDKK"]
78
79    """ Choose resources you want from GetItemsResource enum """
80    """ For more details, refer: https://webservices.amazon.com/paapi5/documentation/get-items.html#resources-parameter """
81    get_items_resource = [
82        GetItemsResource.ITEMINFO_TITLE,
83        GetItemsResource.OFFERS_LISTINGS_PRICE,
84    ]
85
86    """ Forming request """
87
88    try:
89        get_items_request = GetItemsRequest(
90            partner_tag=partner_tag,
91            partner_type=PartnerType.ASSOCIATES,
92            marketplace="www.amazon.co.jp",
93            condition=Condition.NEW,
94            item_ids=item_ids,
95            resources=get_items_resource,
96        )
97    except ValueError as exception:
98        print("Error in forming GetItemsRequest: ", exception)
99        return
100
101    try:
102        """ Sending request """
103        response = default_api.get_items(get_items_request)
104
105        print("API called Successfully")
106        print("Complete Response:", response)
107
108        """ Parse response """
109        if response.items_result is not None:
110            print("Printing all item information in ItemsResult:")
111            response_list = parse_response(response.items_result.items)
112            for item_id in item_ids:
113                print("Printing information about the item_id: ", item_id)
114                if item_id in response_list:
115                    item = response_list[item_id]
116                    if item is not None:
117                        if item.asin is not None:
118                            print("ASIN: ", item.asin)
119                        if item.detail_page_url is not None:
120                            print("DetailPageURL: ", item.detail_page_url)
121                        if (
122                            item.item_info is not None
123                            and item.item_info.title is not None
124                            and item.item_info.title.display_value is not None
125                        ):
126                            print("Title: ", item.item_info.title.display_value)
127                        if (
128                            item.offers is not None
129                            and item.offers.listings is not None
130                            and item.offers.listings[0].price is not None
131                            and item.offers.listings[0].price.display_amount is not None
132                        ):
133                            print(
134                                "Buying Price: ",
135                                item.offers.listings[0].price.display_amount,
136                            )
137                else:
138                    print("Item not found, check errors")
139
140        if response.errors is not None:
141            print("\nPrinting Errors:\nPrinting First Error Object from list of Errors")
142            print("Error code", response.errors[0].code)
143            print("Error message", response.errors[0].message)
144
145    except ApiException as exception:
146        print("Error calling PA-API 5.0!")
147        print("Status code:", exception.status)
148        print("Errors :", exception.body)
149        print("Request ID:", exception.headers["x-amzn-RequestId"])
150
151    except TypeError as exception:
152        print("TypeError :", exception)
153
154    except ValueError as exception:
155        print("ValueError :", exception)
156
157    except Exception as exception:
158        print("Exception :", exception)
159
160get_items()