无法仅删除一个json项

Question

我正在处理问题。我只想通过found属性删除JSON项目，这里是Json：

{"name": "Nike shirt", "price": "20", "size": "M", "additionalInfo": "best shirt ever", "gender": "male", "itemType": "shirts"}
{"name": "adidas airmax", "price": "30", "size": "40", "additionalInfo": "best shoe ever", "gender": "male", "itemType": "running shoes"}

这里是删除方法：

@staticmethod
def deleteFromCart(cartJson,searchAttribute):
        for item in Item.jsonOpener(cartJson):
            if(item.getName == searchAttribute):
                del item
        with open(cartJson, "w") as filelines: 
            for item in Item.jsonOpener(cartJson):               
                jsonString = json.dumps(item.__dict__)
                filelines.write(jsonString + "\n")  

例如，我想删除“ Nike衬衫”：Item.deleteFromCart（“ items.json”，“ Nike衬衫”），但它删除了我的所有内容。谢谢您的回答。

我希望

{"name": "adidas airmax", "price": "30", "size": "40", "additionalInfo": "best shoe ever", "gender": "male", "itemType": "running shoes"} 

Answer 1

您正在尝试读写同一文件同时：

with open(cartJson, "w") as filelines:  # here you open file for writing, which destroys contents
    for item in Item.jsonOpener(cartJson):  # and here you try to read the contents that no longer exist

您应该首先将文件读入变量，然后打开文件进行写，然后将数据写回：

def deleteFromCart(cartJson,searchAttribute):
    data = []
    for item in Item.jsonOpener(cartJson):               
        if item.getName() != searchAttribute:
            # DON'T store the item you want deleted
            jsonString = json.dumps(item.__dict__)
            data.append(jsonString)
    with open(cartJson, "w") as filelines: 
        for line in data:
            filelines.write(line + "\n")