django - 自定义 django-admin 命令 - AttributeError : 'Command' object has no attribute 'stdout'

Question

按照编写自定义 django-admin 命令的示例 here ，我创建了以下自定义命令:

from django.core.management.base import BaseCommand, CommandError

class Command(BaseCommand):
    args = ''
    help = 'Test command'

    def handle(self, *args, **options):
        self.stdout.write("Hello World!")

令人惊讶的是，我收到了以下堆栈跟踪:

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'

怎么会？这是一个非常基本的自定义命令，据我所知符合示例。

我正在使用 Django 1.2.1

Answer 1

由于这是 Google 上的第一次点击，我将针对具有相同错误消息的另一个问题编写另一个解决方案:如果您的类 Command 实现了 __init__，它必须调用父类(super class)的 __init__。

这会起作用:

from django.core.management.base import BaseCommand

class Command(BaseCommand):

    def __init__(self, *args, **kwargs):
        super(Command, self).__init__(*args, **kwargs)
        ... do stuff

这行不通:

from django.core.management.base import BaseCommand

class Command(BaseCommand):

    def __init__(self, *args, **kwargs):
       ... do stuff