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Python图书答疑

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李伟杰

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《Python Web开发从入门到实践》这本书里的5.5.7.2案例老是报错。

发表在Python图书答疑 2022-03-08 《Python Web开发从入门到实践》第5章企业级开发框架Django 156页-157页

是否精华是否

版块置顶: 是否

class PublishYearFilter(admin.SimpleListFilter):

  title = _('发布年份')

    parameter_name = 'year'

    def lookups(self, request, model_admin):

        return (
            ('2020', _('2020年')),
            ('2019', _('2019年')),
        )

    def queryset(self, request, queryset):

        if self.value() == '2019':
            return queryset.filter(publish_date__get=date(2019, 1, 1),
                                    publish_date__lte=date(2019, 12, 31))

        if self.value() == '2020':
            return queryset.filter(publish_date__get=date(2020, 1, 1),
                                    publish_date__lte=date(2020, 12, 31))

class ArticleAdmin(admin.ModelAdmin):
    """
    创建UserAdmin类，继承于admin.ModelAdmin
    """
    #  配置展示列表，在User版块下的列表展示

    # 配置过滤查询字段，在User版块下右侧过滤框
    list_filter = ('title', 'user__username', PublishYearFilter)  #

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李伟杰

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2022-03-08

沙发

运行结果

File "F:\python\lib\site-packages\django\utils\autoreload.py", line 87, in raise_last_exception

raise _exception[1]

File "F:\python\lib\site-packages\django\core\management\__init__.py", line 381, in execute

autoreload.check_errors(django.setup)()

File "F:\python\lib\site-packages\django\utils\autoreload.py", line 64, in wrapper

fn(*args, **kwargs)

File "F:\python\lib\site-packages\django\__init__.py", line 24, in setup

apps.populate(settings.INSTALLED_APPS)

File "F:\python\lib\site-packages\django\apps\registry.py", line 122, in populate

app_config.ready()

File "F:\python\lib\site-packages\django\contrib\admin\apps.py", line 27, in ready

self.module.autodiscover()

File "F:\python\lib\site-packages\django\contrib\admin\__init__.py", line 24, in autodiscover

autodiscover_modules('admin', register_to=site)

File "F:\python\lib\site-packages\django\utils\module_loading.py", line 57, in autodiscover_modules

import_module('%s.%s' % (app_config.name, module_to_search))

File "F:\python\lib\importlib\__init__.py", line 127, in import_module

return _bootstrap._gcd_import(name[level:], package, level)

File "<frozen importlib._bootstrap>", line 1030, in _gcd_import

File "<frozen importlib._bootstrap>", line 1007, in _find_and_load

File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked

File "<frozen importlib._bootstrap>", line 680, in _load_unlocked

File "<frozen importlib._bootstrap_external>", line 850, in exec_module

File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed

File "F:\blog\article\admin.py", line 20, in <module>

class PublishYearFilter(admin.SimpleListFilter):

File "F:\blog\article\admin.py", line 22, in PublishYearFilter

title = _('发布年份')

NameError: name '_' is not defined

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2022-03-08

板凳

title = _('发布年份')

def lookups(self, request, model_admin):

        return (
            ('2020', _('2020年')),
            ('2019', _('2019年')),

------------------------------------------------------

这几个地方都有一个下划线_，我把下划线去掉，可以运行代码案例。但是，在实例网站中输入年号，查找不了对应的文章。

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2022-03-08

地板

在网站实例中点击By发布年份下2019年的链接，CMD命令行屏幕显示错误代码：

[08/Mar/2022 17:13:47] "GET /admin/article/article/ HTTP/1.1" 200 10201

Internal Server Error: /admin/article/article/

Traceback (most recent call last):

File "F:\python\lib\site-packages\django\core\handlers\exception.py", line 47, in inner

response = get_response(request)

File "F:\python\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response

response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "F:\python\lib\site-packages\django\contrib\admin\options.py", line 622, in wrapper

return self.admin_site.admin_view(view)(*args, **kwargs)

File "F:\python\lib\site-packages\django\utils\decorators.py", line 130, in _wrapped_view

response = view_func(request, *args, **kwargs)

File "F:\python\lib\site-packages\django\views\decorators\cache.py", line 57, in _wrapped_view_func

response = view_func(request, *args, **kwargs)

File "F:\python\lib\site-packages\django\contrib\admin\sites.py", line 236, in inner

return view(request, *args, **kwargs)

File "F:\python\lib\site-packages\django\utils\decorators.py", line 43, in _wrapper

return bound_method(*args, **kwargs)

File "F:\python\lib\site-packages\django\utils\decorators.py", line 130, in _wrapped_view

response = view_func(request, *args, **kwargs)

File "F:\python\lib\site-packages\django\contrib\admin\options.py", line 1710, in changelist_view

cl = self.get_changelist_instance(request)

File "F:\python\lib\site-packages\django\contrib\admin\options.py", line 742, in get_changelist_instance

return ChangeList(

File "F:\python\lib\site-packages\django\contrib\admin\views\main.py", line 100, in __init__

self.queryset = self.get_queryset(request)

File "F:\python\lib\site-packages\django\contrib\admin\views\main.py", line 464, in get_queryset

new_qs = filter_spec.queryset(request, qs)

File "F:\blog\article\admin.py", line 36, in queryset

return queryset.filter(publish_date__gte=date(2019, 1, 1),

NameError: name 'date' is not defined

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2022-03-08

NameError at /admin/article/article/

name 'date' is not defined

Request Method:	GET
Request URL:	http://127.0.0.1:8000/admin/article/article/?year=2019
Django Version:	4.0.2
Exception Type:	NameError
Exception Value:	name 'date' is not defined
Exception Location:	F:\blog\article\admin.py, line 36, in queryset
Python Executable:	F:\python\python.exe
Python Version:	3.9.10
Python Path:	['F:\\blog', 'F:\\python\\python39.zip', 'F:\\python\\DLLs', 'F:\\python\\lib', 'F:\\python', 'F:\\python\\lib\\site-packages']
Server time:	Tue, 08 Mar 2022 09:18:25 +0000