我正在使用以下代码构建Django管理员的字段集：
sizeof(Dummy) = 1这引起了我的错误：
new_fieldsets = [
(None, {
"fields": ("title", "slug", "parent"),
}),
("Security", {
"fields": ("requires_authentication", "hide_from_anonymous"),
}),
("Publication", {
"fields": ("publication_date", "expiry_date", "is_online"),
"classes": ("collapse",)
}),
("Navigation", {
"fields": ("short_title", "in_navigation"),
"classes": ("collapse",)
})
]
new_fieldsets.extend(PageBaseAdmin.fieldsets)
removed_fieldsets = [
new_fieldsets.index(PageBaseAdmin.TITLE_FIELDS),
new_fieldsets.index(PageBaseAdmin.PUBLICATION_FIELDS),
new_fieldsets.index(PageBaseAdmin.NAVIGATION_FIELDS)
]
fieldsets = [v for k, v in enumerate(new_fieldsets) if k not in removed_fieldsets]
如果我换掉列表理解：
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
utility.execute()
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/core/management/__init__.py", line 312, in execute
django.setup()
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/apps/registry.py", line 115, in populate
app_config.ready()
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/contrib/admin/apps.py", line 22, in ready
self.module.autodiscover()
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/contrib/admin/__init__.py", line 24, in autodiscover
autodiscover_modules('admin', register_to=site)
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/site-packages/django/utils/module_loading.py", line 74, in autodiscover_modules
import_module('%s.%s' % (app_config.name, module_to_search))
File "/Users/dangamble/Envs/cms-testingP3/lib/python3.4/importlib/__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "/Users/dangamble/Workspace/other/cms/cms/apps/pages/admin.py", line 46, in <module>
class PageAdmin(PageBaseAdmin):
File "/Users/dangamble/Workspace/other/cms/cms/apps/pages/admin.py", line 83, in PageAdmin
fieldsets = [v for k, v in enumerate(new_fieldsets) if k not in removed_fieldsets]
File "/Users/dangamble/Workspace/other/cms/cms/apps/pages/admin.py", line 83, in <listcomp>
fieldsets = [v for k, v in enumerate(new_fieldsets) if k not in removed_fieldsets]
NameError: name 'removed_fieldsets' is not defined
一切都很好，花花公子。值得注意的是，这在Python 2中也可以正常工作。此外，我也清除了所有fieldsets = []
for k, v in enumerate(new_fieldsets):
if k not in removed_fieldsets:
fieldsets.append(v)
个文件夹。
一直在挠头，无法为我的生活而努力，因为我在理解它不能在P3上工作时做错了。我做了一些谷歌搜索，无法找到对__pycache__或列表理解在P3中改变的方式的任何改变，所以我很难过......