custom django-admin commands - AttributeError: 'Command' object has no attribute 'stdout'
Following the example of writing a custom django-admin command here, I've created the following custom command:
from django.core.management.base import BaseCommand, CommandError
class Command(BaseCommand):
args = ''
help = 'T开发者_StackOverflowest command'
def handle(self, *args, **options):
self.stdout.write("Hello World!")
Surprisingly, I receive the following stack trace:
Traceback (most recent call last):
File "D:\My Documents\Dev\MyProject\svn\trunk\dj_project\manage.py", line 11, in <module>
execute_manager(settings)
File "C:\Python26\lib\site-packages\django\core\management\__init__.py", line 438, in execute_manager
utility.execute()
File "C:\Python26\lib\site-packages\django\core\management\__init__.py", line 379, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python26\lib\site-packages\django\core\management\base.py", line 191, in run_from_argv
self.execute(*args, **options.__dict__)
File "C:\Python26\lib\site-packages\django\core\management\base.py", line 218, in execute
output = self.handle(*args, **options)
File "D:\My Documents\Dev\MyProject\svn\trunk\dj_project\..\dj_project\dj_app\management\commands\mytest.py", line 8, in handle
self.stdout.write("Hello World!")
AttributeError: 'Command' object has no attribute 'stdout'
How come? This is a very basic custom command that as far as I understand conforms to the example.
I'm using django 1.2.1
Since this is the first hit on Google I'll write another solution to another problem with the same error message: If your class Command implements __init__, it has to call __init__ of the superclass.
This will work:
from django.core.management.base import BaseCommand
class Command(BaseCommand):
def __init__(self, *args, **kwargs):
super(Command, self).__init__(*args, **kwargs)
... do stuff
This won't work:
from django.core.management.base import BaseCommand
class Command(BaseCommand):
def __init__(self, *args, **kwargs):
... do stuff
There are two easy solutions here. The simple one is to simply convert all of your self.stdout
lines to print
statements instead.
That's an OK solution and you can do it.
The better solution, since self.stdout
is set up in the execute()
method, is to...run the execute()
method.
So instead of:
Command().handle()
Do:
Command().execute()
That'll set up the self.stdout
variable correctly and you'll be off and running.
It looks like the mapping to self.stdout
is a very new change in Django's trunk version, committed in May. If you're running the 1.2 release or earlier, this won't work - and you should be using the earlier documentation.
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