Remove getCallback indirection in modules Instead, assume that the imported module contains the Callback class that was previously returned by getCallback. This is done to prevent a circular import (caused by the __init__ importing a submodule).

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from django.contrib import admin

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from django.contrib.sites.models import Site

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class SiteAdmin(admin.ModelAdmin):

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    list_display = ('domain', 'name')

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    search_fields = ('domain', 'name')

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admin.site.register(Site, SiteAdmin)