Percentage of active customers using any-site login

calc.py

from __future__ import division

from django.db.models import Count

system_setting_pks = list(
  Customer.objects.annotate(
    tenant_count=Count('tenant_set')
  ).filter(tenant_count__gt=1).values_list('settings__pk', flat=True)
)
num_systems = len(system_setting_pks)

not_enabled_systems = list(
  CustomerSettings.objects.filter(
    pk__in=system_setting_pks,
    enable_login_from_any_site=False,
  ).select_related('customer')
)
num_enabled_systems = num_systems - len(not_enabled_systems)
print "Enabled ratio: {0}".format(num_enabled_systems/num_systems)

print "Not enabled:"
for cs in not_enabled_systems:
  print "{0}".format(cs.customer.name)