Python 将词典添加到词典内的列表

我正在浏览一个CSV文件，其中包含学生家长的详细信息，并将数据加载到以学生ID为键的词典中

每个字典值都有一个父项列表。每一位家长都是一本字典，上面有他们的名字和电子邮件地址。我可以添加没有问题的第一个父级，但是当我尝试将第二个父级附加到列表中时，我得到了一个错误。这是我的代码：

def parentsFile(location):
    with open(location) as readfile:
        doc = csv.DictReader(readfile, delimiter=",")
        data = {}
        # Read the data and add to multi-dimentional dictionary
        for row in doc:
            if row["ID"] not in data:  # No previous entry for student
                data[row["ID"]] = {}
                data[row["ID"]][0] = {}
                data[row["ID"]][0]["lastName"] = row["Last_Name"]
                data[row["ID"]][0]["firstName"] = row["First_Name"]
                data[row["ID"]][0]["email"] = row["Email_Address"]
            else:   # There is a previous entry, this is the second parent entry
                new = {}
                new["lastName"] = row["Last_Name"]
                new["firstName"] = row["First_Name"]
                new["email"] = row["Email_Address"]
                data[row["ID"]].append(new)
    return data

这是我收到的错误消息：

data[row["ID"]].append(new)
AttributeError: 'dict' object has no attribute 'append'

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我所有的谷歌搜索都告诉我，我可以在字典里的列表中添加词尾。是不是我的问题在于将词典添加到词典中的列表中？

正如Hamza和Stephen所指出的，我已经声明我的第二级是词典而不是列表。这导致了我的错误。我已将代码更改为：

for row in doc:
            if row["ID"] not in data:  # No previous entry for student
                new = {}
                new["lastName"] = row["Last_Name"]
                new["firstName"] = row["First_Name"]
                new["email"] = row["Email_Address"]
                data[row["ID"]] = []
                data[row["ID"]].append(new)
            else:   # There is a previous entry, this is the second parent entry
                num = len(data[row["ID"]])
                new = {}
                new["lastName"] = row["Last_Name"]
                new["firstName"] = row["First_Name"]
                new["email"] = row["Email_Address"]
                data[row["ID"]].append(new)

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您正在尝试附加到词典中。您定义的数据[row['ID']={}应该是：

data[row['ID']]=[]

谢谢，就这样！错误消息应该已经泄露了它。我不知道为什么我看不到。