runserver must be manually restarted after error in models.py
Question: I'm following the book The Definitive Guide to Django and one thing I've
started noticing is that whenever I make a single error in my models file, the
server just hangs and is not automatically restarted when the error is fixed.

Here's an example: I save the file with a line like this

    
    
    email = models.EmailField(blank=Tru)
    

Which raises the obvious error and stack trace

    
    
    Validating models...
    
    Unhandled exception in thread started by <bound method Command.inner_run of <django.core.management.commands.runserver.Command object at 0x00000000025B0400>>
    Traceback (most recent call last):
      File "C:\Python27\lib\site-packages\django\core\management\commands\runserver.py", line 91, in inner_run
        self.validate(display_num_errors=True)
      File "C:\Python27\lib\site-packages\django\core\management\base.py", line 266, in validate
        num_errors = get_validation_errors(s, app)
      File "C:\Python27\lib\site-packages\django\core\management\validation.py", line 30, in get_validation_errors
        for (app_name, error) in get_app_errors().items():
      File "C:\Python27\lib\site-packages\django\db\models\loading.py", line 158, in get_app_errors
        self._populate()
      File "C:\Python27\lib\site-packages\django\db\models\loading.py", line 64, in _populate
        self.load_app(app_name, True)
      File "C:\Python27\lib\site-packages\django\db\models\loading.py", line 88, in load_app
        models = import_module('.models', app_name)
      File "C:\Python27\lib\site-packages\django\utils\importlib.py", line 35, in import_module
        __import__(name)
      File "C:\....\models.py", line 17, in <module>
        class Author(models.Model):
      File "C:\...\models.py", line 20, in Author
        email = models.EmailField(blank=Tru)
    NameError: name 'Tru' is not defined 
    

Now, if I change `Tru` to `True`, the server does not restart. Is this
intentional? Or is there something wrong with my application? I've just
started learning Django so I have no idea if this is common behaviour.

I'm on Windows, running Python 2.7.3 and Django 1.4.1.


Answer: Not just you- I also experience this on occasion.

Although the development server is usually pretty good about restarting after
code changes, some particularly egregious errors (especially in your
`models.py`) can sometimes cause it to hang. Just need to terminate it
(`Ctrl+C`), restart it, and continue along your merry way.

