将management.call_command（）标准输出重定向到文件 [英] Redirect management.call_command() stdout to a file

问题描述

我一直在尝试使用以下代码重定向自定义django命令的标准输出：

I've been trying to redirect the standard output of a custom django command using this piece of code:

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


class Command(BaseCommand):

    def handle(self, *args, **options):
        f = open('/tmp/output', 'r+')
        management.call_command('basequery', 'list', 'log', stdout=f)
        f.close()

但是，当我从manage.py调用此标准输出时出现在控制台上，并且/ tmp / output文件已创建但为空。

However, when I call this from manage.py the standard output appears on the console and the /tmp/output file is created but empty.

这是django 文档

Here's the django documentation of what I'm trying to do

推荐答案

您的命令可能只是直接使用 print 。为了能够在管理命令中捕获或重定向打印，您需要使用命令实例的 self.stdout 句柄：

Your command is probably just using print directly. To be able to capture or redirect prints in a management command, you'll want to use the self.stdout handle of the command instance:

from __future__ import print_function

class Command(BaseCommand):

    def handle(self, *args, **options):
        # incorrect way to print in a management command:
        print('This line will go to the terminal')

        # correct ways to print in a management command:
        print('This line will go into the StringIO', file=self.stdout)
        self.stdout.write('This will also go into the StringIO')

如果您绝对不能更改命令的错误打印语句（这是'basequery中的代码'命令在您的示例中出错），那么您可以使用上下文管理器临时重定向标准输出，以捕获该输出。重定向后还原旧的标准输出很重要。参见 contextlib.redirect_stdout 。

If you absolutely can not change the buggy print statements of the command (it's the code in 'basequery' command at fault in your example), then you can use a context manager to temporarily redirect stdout in order to capture that output. It's important to restore the old stdout after redirection. See contextlib.redirect_stdout.

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