问Python -如何在熊猫/ JSON中扁平JSON消息

EN

JSON_MSG = {
    'Header': {
        'Timestamp': '2020-10-25T02:49:25.489Z',
        'ID': '0422',
        'msgName': 'Order',
        'Source': 'OrderSys'
    },
    'CustomerOrderLine': [
        {
            **'Parameter'**: [
                {'ParameterID': 'ACTIVATION_DATE', 'ParameterValue': '2020-10-25'},
                {'ParameterID': 'CYCLES', 'ParameterValue': '1'}, 
                {'ParameterID': 'EXPIRY_PERIOD', 'ParameterValue': '30'},
                {'ParameterID': 'MAX_NUMBER', 'ParameterValue': '1'}
            ],
            'Subscription': {
                'Sub': '3020611',
                'LoanAcc': '',
                'CustomerAcc': '2020002',
                'SubscriptionCreatedDate': '2020-06-23T14:42:30Z',
                'BillingAcc': '40010101',
                'SubscriptionContractTerm': '12',
                'ServiceAcc': '11111',
                'SubscriptionStatus': 'Active'
            },
            'PaymentOpt': 'Upfront',
            'OneTimeAmt': '8.0',
            'RecurringAmt': '0.0'
            'BeneficiaryID': '',
            'CustomerOrderID': '111',
            'OrderLineCreatedDate': '2020-10-25T02:47:18Z',
            'ProductOfferingPriceId': 'PP_6GB_Booster',
            'ParentCustomerOrderLineID': '',
            'OrderLineRequestedDate': '2020-10-25T00:00:00.000Z',
            'ProductCategoryId': 'PRODUCT_OFFER',
            'OrderLinePurposeName': 'ADD',
            'OrderQuantity': '1.0',
            'CustomerOrderLineID': '11111',
            'OrderLineDeliveryAddress': {
                'OrderLineDeliveryPostCode': '',
                'OrderLineDeliveryTown': '',
                'OrderLineDeliveryCounty': '',
                'OrderLineDeliveryCountryName': ''
            },
            'ProductInstanceID': '95',
            'ProductOfferingId': 'OFF_6GBBOOST_MONTHLY'
        }
    ]
}

data = json.loads(JSON_MSG)
list1 = data['CustomerOrderLine']
rec_count = len(list1)