使用 python 从 json 文件中保留特定字典并查找光标所在位置

Question

我有一个json文件，我想制作一个计数器，每次一天（天=最后一天-今天）（最后一天是计数器停止的那一天，这一天将为0）是0，那么我应该删除特定的我成功地制作了计数器，但我不知道如何让它从 json 文件中删除特定的字典。也许如果我可以读取光标所在位置并使用字典计数 count day = 0 那么一切都会更好。

这里是json文件的类型：

   [
        {
            "Name": "bla",
            "Lastname": "ftr",
            "date": "20/12/2023"
        },
        {
            "Name": "dfas",
            "Lastname": "fsae",
            "date": "18/12/2023"
        },
        {
            "Name": "john",
            "Lastname": "rapper",
            "date": "18/11/2023"
        }


     ]

    import time
    from datetime import datetime
    import json
    import time

    def countdown(stop):
        while True:
            difference = stop - datetime.now()
            if difference.days == 0:
                print("Good bye!")
                break
                print("The count is: " + str(difference.days) + " day(s)")
                break

    def handling():
        with open('tst.json') as f:    
            data = json.load(f)
            for i in range(len(data)):
              date = data[i]["date"]
              i = i + 1
              x = (datetime.now() - datetime.strptime(date, '%d/%m/%Y')).days
              print(x)
              if x == 0:
                        print("Here i want to remove the dictionary that counts day = 0)

我也尝试过，但没有任何反应：

    import json

    with open('tst.json') as fin:
        your_structure = json.load(fin)
    for value in your_structure:
        p = value.pop("date", None)
        print(p)
        print("all done")

Answer 1

功能

handling

需要一些改变。代码未经测试，所以要小心：

   def handling():
        with open('tst.json') as f:    
            data = json.load(f)
            data_copy = data[:] # Don't iterate over data while changing it, use a copy
            for i in range(len(data)):
              date = data_copy[i]["date"]
              # i = i + 1 # Not useful
              x = (datetime.now() - datetime.strptime(date, '%d/%m/%Y')).days
              print(x)
              if x == 0:
                  del data[i]
        
        # data was modified, now it must be saved
        with open('tst.json', 'w') as f:
            json.dump(data, f)