比较python中字典中的对象

Question

我从通常以 JSON 格式提供的用户 API 请求（来自 API 正文）中获取一些数据有效负载。它作为字典存储在我的 python 代码中。

"Data":{

      "Ready Date":"2020-01-31T12:00:00",

      "Ready Time":"2020-01-31T12:00:00",

      "Delivery Date":"2020-02-15T12:00:00",

      "Service Level":"EC",

      "Close Time":"2020-01-31T17:00:00"}

我想验证给定的字段。如果用户没有给出“就绪日期”，它应该说缺少就绪日期并检查该 JSON 中的每个对象并说明是否缺少某些内容

我的代码：我将所有字典键存储在一个数组中，例如：

a = ["Ready Date","Ready Time","DeliveryDate","Service Level","Close Time"]

我的逻辑

for value in data:

    if value not in a:

        print("value Missing" : Value)

    else:

        print("All values are entered")

结果：如果我给字典和列表中的所有值都一样，

My results prints :

All values are entered

All values are entered

All values are entered

如果我从字典中删除任何值并检查条件，我会得到以下打印结果

value missing : Ready Date

All values are entered

All values are entered

我需要避免循环并且只打印一次

Answer 1

你不应该在没有首先提供你尝试过的证据的情况下提出问题（尽管你没有提出问题你给了任务），但答案如下：data = {      "Ready Date":"2020-01-31T12:00:00",      "Ready Time":"2020-01-31T12:00:00",      "Delivery Date":"2020-02-15T12:00:00",      "Service Level":"EC",      "Close Time":"2020-01-31T17:00:00"}a = ["Ready Date","Ready Time","DeliveryDate","Service Level","Close Time"]missing = [field for field in a if field not in data]if len(missing) == 0:    print("All values are entered")else:    [print(f"Missing value: {field}") for field in missing]