Question

在以下代码中，“ row [header]”出现错误：

for field in Document._meta.get_fields():
    headers.append(field.name)

docs = Document.objects.order_by('id')
for doc in docs:
    row = {}
    for header in headers:
        if hasattr(doc, header):
            row[header] = getattr(doc, header)
    files.append(row)

Python说：TypeError：列表索引必须是整数或切片，而不是str

出了什么问题？

Python追溯：

Traceback (most recent call last):
  File "/home/niels/PycharmProjects/sitesv/env/lib/python3.5/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/niels/PycharmProjects/sitesv/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/niels/PycharmProjects/sitesv/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/niels/PycharmProjects/sitesv/files/views.py", line 87, in get_file_list
    row[header] = getattr(doc, header)
TypeError: list indices must be integers or slices, not str

Answer 1

从评论中确认答案：

变量row已经在更高的范围内，因此对它的写入将被另一个线程对其的写入所覆盖。

将row的名称更改为其他名称可以解决问题。

将键值对添加到dict

1 个答案: