Export to csv action for users in the Django admin.

admin.py

import csv
from django.contrib import admin
from django.http import HttpResponse

class UserAdmin(ModelAdmin):

    actions = ["export_as_csv"]

    def export_as_csv(self, request, queryset):
        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = 'attachment; filename="users.csv"'
        user_fields = ['id', 'date_joined', 'email', 'username']
        writer = csv.DictWriter(response, user_fields)
        writer.writeheader()
        for user in queryset:
            user_dict = {field: unicode(getattr(user, field)).encode('utf-8') for field in user_fields}
            writer.writerow(user_dict)
        return response
    export_as_csv.short_description = "Download selected users as csv"