Dynamic Fieldsets in Django Admin

Problem: the fieldsets option for the admin interface (classes defined in admin.py) requires that you explicitly list every single field in the model in the fieldset list that you pass to it.  This gets tedious if you add a field to a model, as you also have to add it to this admin.py.  Not very DRY.

Solution:
In models.py
from django.db import models
class My(models.Model):
    a = models.CharField(max_length=10)
    b = models.CharField(max_length=10)
    c = models.CharField(max_length=10)
    d = models.CharField(max_length=10)
    e = models.CharField(max_length=10)
    f = models.CharField(max_length=10)
    g = models.CharField(max_length=10)
    h = models.CharField(max_length=10)

In admin.py
from django.contrib import admin
from django.forms.models import fields_for_model
from f import models
class MyAdmin(admin.ModelAdmin):
    def __init__(self, *args, **kwargs):
        super(MyAdmin, self).__init__(*args, **kwargs)
        all_fields = set(fields_for_model(models.My))
        fieldset1_fields = ('e', 'f',)
        fieldset2_fields = ('g', 'h',)
        fieldset_fields = set(fieldset1_fields) | set(fieldset2_fields)
        rest_fields = list(all_fields - fieldset_fields)
        self.fieldsets = (
            (None, {
                'fields': rest_fields
            }),
            ('Fieldset 1', {
                'classes': ('collapse',),
                'fields': fieldset1_fields
            }),
            ('Fieldset 2', {
                'classes': ('collapse',),
                'fields': fieldset2_fields
            }),
        )
    models = models.My
admin.site.register(models.My, MyAdmin)


Thanks for the help lorochka85