Python 将键值对添加到dict
在以下代码中,我在“row[header]”处得到一个错误:Python 将键值对添加到dict,python,django,list,dictionary,key,Python,Django,List,Dictionary,Key,在以下代码中,我在“row[header]”处得到一个错误: 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[
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片,而不是str
出了什么问题
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
根据评论确认答案: 变量
行
已处于更高的作用域,因此对它的写入会被另一个线程对它的写入覆盖
将
行的名称
更改为其他名称会使问题消失。能否发布Python提供的完整回溯?错误消息中定义了您的问题。您正在使用字符串为列表编制索引,但需要使用切片或int为列表编制索引。行={}定义一个dict,而不是列表,否?将行row[header]=getattr(doc,header)
拆分为两行:rh=getattr(doc,header)
然后row[header]=rh
。这至少可以解决该行的哪一部分出错的问题。我想不出怎么做,但您的代码的行为就像row变量在全局范围内,而另一个线程将其撞坏。