【LINE Blockchain API】『NameError: name ‘get_signature’ is not defined』と出た時の対処法

.
├── line_blockchain_api.py  # サンプルコード
├── signature_generator.py  # get_signatureメソッドがあるファイル
└── request_flattener.py    # 署名作成で必要な文字列を作成するクラスファイル

import hmac
import hashlib
import base64

from request_flattener import RequestBodyFlattener

def createSignTarget(method, path, timestamp, nonce, parameters: dict = {}):
    signTarget = f'{nonce}{str(timestamp)}{method}{path}'
    if(len(parameters) > 0):
        signTarget = signTarget + "?"
    return signTarget


def get_signature(method: str, path: str, nonce: str, timestamp: int, secret: str, query_params: dict = {}, body: dict = {}):

    body_flattener = RequestBodyFlattener()
    all_parameters = {}
    all_parameters.update(query_params)
    all_parameters.update(body)

    signTarget = createSignTarget(method.upper(), path, timestamp, nonce, all_parameters)

    if (len(query_params) > 0):
        signTarget += '&'.join('%s=%s' % (key, value) for (key, value) in query_params.items())

    if (len(body) > 0):
        if (len(query_params) > 0):
            signTarget += "&" + body_flattener.flatten(body)
        else:
            signTarget += body_flattener.flatten(body)

    raw_hmac = hmac.new(bytes(secret, 'utf-8'), bytes(signTarget, 'utf-8'), hashlib.sha512)
    result = base64.b64encode(raw_hmac.digest()).decode('utf-8')

    return result

class RequestBodyFlattener:

    def __flatten_key_value(self, key, value):
        if (isinstance(value, str)):
            return f"{key}={value}"

        if (isinstance(value, list)):
            l_key_value = {}
            for index, ele in enumerate(value):
                for lkey in list(ele.keys() | l_key_value.keys()):
                    if lkey in ele.keys():
                        lvalue = ele[lkey]
                    else:
                        lvalue = ""

                    if (lkey in l_key_value.keys()):
                        l_key_value[lkey] = f"{l_key_value[lkey]},{lvalue}"
                    else:
                        l_key_value[lkey] = f"{',' * index}{lvalue}"
            return "&".join("%s=%s" % (f"{key}.{lkey}", lvalue) for (lkey, lvalue) in sorted(l_key_value.items()))

    def flatten(self, body: dict = {}):
        sorted_body = sorted(body.items())
        return "&".join(self.__flatten_key_value(key, value) for (key, value) in sorted_body)

import os

import requests
import random
import string
import time

############ 追加する ############
from signature_generator import get_signature

def GET_v1_item_tokens_contractId_non_fungibles():
    server_url = os.environ['SERVER_URL']
    service_api_key = os.environ['SERVICE_API_KEY']
    service_api_secret = os.environ['SERVICE_API_SECRET']

    nonce = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(8))
    timestamp = int(round(time.time() * 1000))

    # ここの部分を自身のコントラクトIDに変更する
    path = '/v1/item-tokens/{:contract_id:}/non-fungibles'

    query_params = {
        'limit': 10,
        'orderBy': 'desc',
        'page': 1
    }

    headers = {
        'service-api-key': service_api_key,
        'nonce': nonce,
        'timestamp': str(timestamp)
    }


    signature = get_signature('GET', path, nonce, timestamp, service_api_secret, query_params)
    headers['signature'] = signature

    res = requests.get(server_url + path, params=query_params, headers=headers)
    return res.json()

############ 追加する ############
print(GET_v1_item_tokens_contractId_non_fungibles())

{'responseData': 
    [
        {
            'createdAt': 1649918615569,
            'meta': '{"meta":"meta情報など"}',
            'name': 'TokenName2',
            'tokenType': '10000002',
            'totalBurn': '0',
            'totalMint': '17',
            'totalSupply': '17'
        },
        {
            'createdAt': 1649918444116,
            'meta': '{"meta":"meta情報など"}',
            'name': 'TokenName',
            'tokenType': '10000001',
            'totalBurn': '0',
            'totalMint': '86',
            'totalSupply': '86'
        }
    ]
}

server_url = os.environ['SERVER_URL']
service_api_key = os.environ['SERVICE_API_KEY']
service_api_secret = os.environ['SERVICE_API_SECRET']

server_url = "https://test-api.blockchain.line.me" # テストのURL
service_api_key = "e1df****-****-****-****-******87c708"
service_api_secret = "384e****-****-****-****-******cf3763"