django部署在apache下出现RuntimeError: populate() isn't reentrant错误的解决

在配置apache和django后，出现了无法访问的bug。打开错误日志，出现了很长的错误，无从下手。

django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module.\r
[Wed Mar 18 13:53:45.140257 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62681] Did you install mysqlclient?\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682] mod_wsgi (pid=2836): Failed to exec Python script file 'F:/wamp/www/quality/quality/wsgi.py'.
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682] mod_wsgi (pid=2836): Exception occurred processing WSGI script 'F:/wamp/www/quality/quality/wsgi.py'.
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682] Traceback (most recent call last):\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]   File "F:/wamp/www/quality/quality/wsgi.py", line 20, in <module>\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]     application = get_wsgi_application()\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]   File "f:\\python\\lib\\site-packages\\django\\core\\wsgi.py", line 12, in get_wsgi_application\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]     django.setup(set_prefix=False)\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]   File "f:\\python\\lib\\site-packages\\django\\__init__.py", line 24, in setup\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]     apps.populate(settings.INSTALLED_APPS)\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]   File "f:\\python\\lib\\site-packages\\django\\apps\\registry.py", line 83, in populate\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682]     raise RuntimeError("populate() isn't reentrant")\r
[Wed Mar 18 13:53:45.202743 2020] [wsgi:error] [pid 2836:tid 1512] [client 10.50.134.216:62682] RuntimeError: populate() isn't reentrant\r

这么长的错误，通过mysqldb找到了突破口。需要安装mysqlclient，然后在工程目录的_init_.py文件下，进行引入。

import pymysql
pymysql.install_as_MySQLdb()

莫名其妙搞定了。

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