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"""
This examples shows setting the current user as the default value for a field named 'user'
"""
class MyInline(admin.TabularInline):

    def formfield_for_dbfield(self, db_field, request, **kwargs):
        field = super().formfield_for_dbfield(db_field, request, **kwargs)
        if db_field.name == 'user':
            field.initial = request.user
        return field

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This demonstrates creating a mixin for inlines along with a custom ModelAdmin to inject the instance into the inline for further processing.

One use case is for when you need to override get_field_queryset to filter available options in a dropdown field to limit selection to only those items associated with the parent.

class InstanceAwareInlineMixin(object):
    """
    Create a mixin that supports setting an instance.
    """
    def __init__(self, *args, **kwargs):

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python scrapy-simple-processor.py https://example.com --output-file=/path/to/file.csv

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DNS queries with Python

These examples use DNSPython

pip install dnspython

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version: "2"
services:
  data:
    image: busybox:latest
    volumes:
      - ./persistent/html:/var/www/html:cached
      - ./persistent/mail:/var/mail:cached
      - ./persistent/sql-data:/var/lib/mysql
      - ./persistent/backup:/var/backup
      - ./persistent/logs/apache:/var/apache2/logs