[英]adding a key value pair to dict
在以下代碼中,“ row [header]”出現錯誤:
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說:TypeError:列表索引必須是整數或切片,而不是str
怎么了?
Python回溯:
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
評論已確認答案:
變量row
已經在較高范圍內,因此對它的寫入將被另一個線程對它的寫入所覆蓋。
將row
名更改為其他名稱可以解決問題。
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