custom_fields.py

    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            'fields': ('username', 'email', 'password1', 'password2', 'avatar')}
         ),
    )

    fieldsets = (
        (None, {'fields': ('username', 'password')}),
        (('Personal info'), {
         'fields': ('first_name', 'last_name', 'email', 'avatar')}),
        (('Permissions'), {'fields': ('is_active',
                                      'is_staff', 'is_superuser', 'user_permissions')}),
        (('Important dates'), {'fields': ('last_login', 'date_joined')}),
        (('Groups'), {'fields': ('groups',)}),
    )
    
    hola

otro.py

sdsdsd