我的settings.py被调用4次 - 任何想法为什么？

Question

当我启动本地开发服务器（./manage runserver）时，settings.py会运行四次。我注意到，因为错误/调试消息被打印了四次。

任何想法如何能来？我什至不知道从哪里开始寻找。这对我很重要，因为我正在努力设置Sentry，它不会像现在那样报告站点的任何错误。

更新：
我检查了导入模块import settings，在我的应用程序中没有。

然后我说

import traceback; traceback.print_stack(); print 

到settings.py中。其结果是：

File "./manage.py", line 5, in <module> 
    import settings # Assumed to be in the same directory. 
File "(...)/myapp/settings.py", line 4, in <module> 
    import traceback; traceback.print_stack(); print 

File "./manage.py", line 12, in <module> 
    execute_manager(settings) 
(...) 
File "(...)/site-packages/django/conf/__init__.py", line 73, in __init__ 
    mod = importlib.import_module(self.SETTINGS_MODULE) 
File "(...)/site-packages/django/utils/importlib.py", line 35, in import_module 
    __import__(name) 
File "(...)/myapp/../myapp/settings.py", line 4, in <module> 
    import traceback; traceback.print_stack(); print 

File "./manage.py", line 5, in <module> 
    import settings # Assumed to be in the same directory. 
File "(...)/myapp/settings.py", line 4, in <module> 
    import traceback; traceback.print_stack(); print 

File "./manage.py", line 12, in <module> 
    execute_manager(settings) 
(...) 
File "(...)/site-packages/django/conf/__init__.py", line 73, in __init__ 
    mod = importlib.import_module(self.SETTINGS_MODULE) 
File "(...)/site-packages/django/utils/importlib.py", line 35, in import_module 
    __import__(name) 
File "(...)/myapp/../myapp/settings.py", line 4, in <module> 
    import traceback; traceback.print_stack(); print 

这是预期的行为？如果不是，我怎么能找到我的错误？

Answer 1

它通过sys.path中的不同条目进行访问。你不应该试图自己导入settings;改为导入django.conf.settings。

Answer 2

这种行为实际上发生在全新的Django 1.3项目中。当开发服务器启动的第一次，它4进口：

$ django-admin.py startproject test_project 
$ cd test_project/ 

# settings.py 
print "importing settings.py" 
... 

$ python manage.py runserver 
importing settings.py 
importing settings.py 
importing settings.py 
importing settings.py 
Validating models... 

0 errors found 
Django version 1.3, using settings 'test_project.settings' 
Development server is running at http://127.0.0.1:8000/ 
Quit the server with CONTROL-C. 

如果编辑与开发服务器运行的文件，它只做两名外援：

$ touch settings.py 

输出：

importing settings.py 
importing settings.py 
Validating models... 

0 errors found 
Django version 1.3, using settings 'test_project.settings' 
Development server is running at http://127.0.0.1:8000/ 
Quit the server with CONTROL-C. 

我不知道为什么这样做，或者如果这样做，对非发展小号ervers。但这种行为似乎是正常的。

---

如果您追踪settings.py进口，它不跨多个进口持续值：

# settings.py 
import_count = 0 
import_count += 1 
print "import count: %d" % import_count 

新鲜的开始：

$ python manage.py runserver 
import count: 1 
import count: 1 
import count: 1 
import count: 1 
Validating models... 

修改的文件：

import count: 1 
import count: 1 
Validating models... 

所以也许它是ju st读取文件进行自我配置，然后确认一切正常，然后再导入最终时间并实际使用它？