当我使用markdownx时，错误即将来临
如果我使用markdownxfield()
然后我无法在管理员中编辑模型。错误是这样的：
TypeError at /admin/blogsite/articles/add/
＆＃39;设定＆＃39;对象不可逆
Request Method: GET
Request URL: http://127.0.0.1:8000/admin/blogsite/articles/add/
Django Version: 2.0
Exception Type: TypeError
Exception Value:
＆＃39;设定＆＃39;对象不可逆
Exception Location: C:\Users\liano\Desktop\python\blog\blog_venv\lib\site-packages\django\forms\widgets.py in merge, line 114
Python Executable: C:\Users\liano\Desktop\python\blog\blog_venv\Scripts\python.exe
Python Version: 3.6.2
那么为什么会发生以及如何解决呢？ 追溯： 环境：请求方法：GETRequest URL：http://127.0.0.1:8000/admin/blogsite/articles/add/Django版本：2.0Python版本：3.6.2安装的应用程序：[＆＃39; django.contrib.admin＆＃39;，＆＃39; django.contrib.auth＆＃39; ，＆＃39; django.contrib.contenttypes＆＃39;，＆＃39; django.contrib.sessions＆＃39;，＆＃39; django.contrib.messages＆＃39;，＆＃39; django.contrib.staticfiles＆＃ 39;，＆＃39; blogsite＆＃39;，＆＃39; bootstrap3＆＃39;，＆＃39; markdownx＆＃39;，＆＃39; testapp＆＃39;]已安装的中间件：[＆＃39; django.middleware .security.SecurityMiddleware＆＃39;，＆＃39; django.contrib.sessions.middleware.SessionMiddleware＆＃39;，＆＃39; django.middleware.common.CommonMiddleware＆＃39;，＆＃39; django.middleware.csrf。 CsrfViewMiddleware＆＃39;，＆＃39; django.contrib.auth.middleware.AuthenticationMiddleware＆＃39;，＆＃39; django.contrib.messages.middleware.MessageMiddleware＆＃39;，＆＃39; django.middleware.clickjacking.XFrameOptionsMiddleware＆ ＃39;]回溯：文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ core \ handlers \ exception.py＆＃34;在内部35. response = get_response（request）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ core \ handlers \ base.py＆＃34; in _get_response 128.response = self.process_exception_by_middleware（e，request）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ core \ handlers \ base.py＆＃ 34; in _get_response 126. response = wrapped_callback（request，* callback_args，** callback_kwargs）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ contrib \ admin \ options的.py＆＃34;在包装器574中。返回self.admin_site.admin_view（视图）（* args，** kwargs）文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ utils \ decorators.py＆＃34;在_wrapped_view 142. response = view_func（request，* args，** kwargs）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ _blog_venv \ lib \ site-packages \ django \ views \ decorators \ cache的.py＆＃34;在_wrapped_view_func中44. response = view_func（request，* args，** kwargs）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ contrib \ admin \ sites的.py＆＃34;在内部223.返回视图（请求，* args，** kwargs）文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ contrib \ admin \ options。 PY＆＃34;在add_view 1553. return self.changeform_view（request，None，form_url，extra_context）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ utils \ decorators.py＆ ＃34;在_wrapper 62中。返回bound_func（* args，** kwargs）文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ utils \ decorators.py＆＃34;在_wrapped_view 142. response = view_func（request，* args，** kwargs）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ utils \ decorators.py＆ ＃34;在bound_func 58. return func。 get （self，type（self））（* args2，** kwargs2）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ LIB \站点包\ Django的\的contrib \ ADMIN \ options.py＆＃34;在changeform_view 1450. return self._changeform_view（request，object_id，form_url，extra_context）File＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ contrib \ admin \ options的.py＆＃34;在_changeform_view 1516.media = self.media + adminForm.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ contrib \ admin \ helpers.py＆＃34;在媒体64.media = self.form.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在_media 148. base = sup_cls.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在_media 148. base = sup_cls.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在_media 148. base = sup_cls.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ forms.py＆＃34;在媒体460.media = media + field.widget.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在_media 148. base = sup_cls.mediaFile＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在_media 163.返回m +媒体（定义）文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site-packages \ django \ forms \ widgets.py＆＃34;在添加 135. combined._js = self.merge（self._js，other._js）文件＆＃34; C：\ Users \ liano \ Desktop \ python \ blog \ blog_venv \ lib \ site -packages \ django的\形式\ widgets.py＆＃34;在合并114. for reverse in reverse（list_2）：Exception Type：TypeError at / admin / blogsite / articles / add / Exception Value：＆＃39; set＆＃39;对象不可逆