Django: AttributeError: module ‘mimetypes‘ has no attribute ‘inited‘

对修改的Django项目执行命令出现异常。

$python manage.py runserver

报错日志：

Traceback (most recent call last):
  File "manage.py", line 22, in 
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 257, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 39, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "", line 1014, in _gcd_import
  File "", line 991, in _find_and_load
  File "", line 975, in _find_and_load_unlocked
  File "", line 671, in _load_unlocked
  File "", line 848, in exec_module
  File "", line 219, in _call_with_frames_removed
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/contrib/staticfiles/management/commands/runserver.py", line 3, in 
    from django.core.management.commands.runserver import (
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/management/commands/runserver.py", line 10, in 
    from django.core.servers.basehttp import (
  File "/home/user/apps/venv/lib/python3.8/site-packages/django/core/servers/basehttp.py", line 14, in 
    from wsgiref import simple_server
  File "/usr/lib/python3.8/wsgiref/simple_server.py", line 13, in 
    from http.server import baseHTTPRequestHandler, HTTPServer
  File "/usr/lib/python3.8/http/server.py", line 628, in 
    class SimpleHTTPRequestHandler(baseHTTPRequestHandler):
  File "/usr/lib/python3.8/http/server.py", line 879, in SimpleHTTPRequestHandler
    if not mimetypes.inited:
AttributeError: module 'mimetypes' has no attribute 'inited'

查看重点问题所在：

 File "/usr/lib/python3.8/http/server.py", line 879, in SimpleHTTPRequestHandler
    if not mimetypes.inited:
AttributeError: module 'mimetypes' has no attribute 'inited'

点击源文件查看位于server.py第879行的详细内容：

在server.py中的头部是“import mimetypes”，mimetypes是内置库。查看mimetypes.py源代码，可见变量"inited"是存在的。可见是导入重名的“mimetypes”库导致的异常。仔细查找发现是项目自定义相同名称的模块文件。

命名自定义的mimetypes.py为mimetypesd.py。

重新执行命令：

$python manage.py runserver