如何将来自 Postman 的 Json 数据转换为 python 中的整数？

Question

我在这里使用 MQL5 编写了一个 python 脚本以从 MetaTrader5 获取总历史订单。这是代码，

from_date = datetime(2020, 1, 1)
to_date = datetime.now()
history_orders = mt.history_orders_total(from_date, to_date )
print(history_orders)

我的要求是我需要从用户那里获取 from_date 和 to_date 参数。所以我使用 POST 从 Postman 传递了这些参数 request.here 是 payload

{
     "fromDate" : "2020, 1, 1",
     "toDate": "2020, 11, 8"
}

它说，

history_orders = mt.history_orders_total(datetime(fromDate), datetime(toDate)) TypeError: an integer is required (got type str)

如何将这些 Json 有效负载转换为 python 中的整数？这是我的代码。

@app.route("/", methods=['POST', 'GET'])
def historyOrderTotal():
    fromDate = None
    toDate = None
    if request.method == 'POST':
        fromDate = request.json['fromDate']
        toDate = request.json['toDate']

    mt.initialize()

    history_orders = mt.history_orders_total(datetime(fromDate), datetime(toDate))
    print(history_orders)

Answer 1

你不太关心整数，你想要 datetime 个对象。您已决定要 <year>, <month>, <day> 作为日期的传入序列化 JSON 格式。

所以你可能会这样做：

from datetime import datetime

pattern = "%Y, %m, %d"
from_date = datetime.strptime(fromDate, pattern)
to_date = datetime.strptime(toDate, pattern)

您可能想要添加验证，例如assert from_date <= to_date 等，具体取决于您的用例。

我还建议您查看 ISO 8601 日期格式，这是一种更标准化的日期序列化方式。

调试说明，根据您的意见试试这个：

@app.route("/", methods=['POST', 'GET'])
def historyOrderTotal():
    fromDate = None
    toDate = None
    if request.method == 'POST':
        fromDate = request.json['fromDate']
        toDate = request.json['toDate']
        print("json-from:", fromDate)
        print("json-to:", toDate)
        pattern = "%Y, %m, %d"
        from_date = datetime.strptime(fromDate, pattern)
        to_date = datetime.strptime(toDate, pattern)
        print("parsed-from:", from_date)
        print("parsed-to:", to_date)
        if mt.initialize():
            history_orders = mt.history_orders_total(from_date, to_date)
            print("history-orders", history_orders)
        else:
            print("initialize() failed, error code =", mt.last_error())
    else:
        print(">> Not a POST request")

如何将来自 Postman 的 Json 数据转换为 python 中的整数？

How can I convert Json data that coming from Postman convert into Integers in python?

python

json

metatrader5

postman

mql5