diff --git a/seminar/management/commands/testdata.py b/seminar/management/commands/testdata.py
index dda7b097..0216a180 100644
--- a/seminar/management/commands/testdata.py
+++ b/seminar/management/commands/testdata.py
@@ -4,7 +4,7 @@ import datetime
 import os
 import random
 
-from django.core.management.base import NoArgsCommand
+from django.core.management.base import BaseCommand
 from django.core.management import call_command
 from django.conf import settings
 
@@ -14,7 +14,7 @@ import django.contrib.auth
 User = django.contrib.auth.get_user_model()
 
 
-class Command(NoArgsCommand):
+class Command(BaseCommand):
     help = "Clear database and load testing data."
 
     def handle_noargs(self, **options):
@@ -26,9 +26,10 @@ class Command(NoArgsCommand):
         call_command('migrate', noinput=True)
         self.stdout.write('Vytvarim uzivatele "admin" (heslo "admin") a pseudo-nahodna data ...')
         create_test_data(size=8)
-        self.stdout.write('Vytvoreno %d uzivatelu, %d skol, %d resitelu, %d rocniku, %d cisel, %d problemu, %d reseni.' %
-                (User.objects.count(), Skola.objects.count(), Resitel.objects.count(), Rocnik.objects.count(),
-                Cislo.objects.count(), Problem.objects.count(), Reseni.objects.count()))
+        self.stdout.write('Vytvoreno %d uzivatelu, %d skol, %d resitelu, %d rocniku, %d cisel, 
+                %d problemu, %d reseni.'.format(User.objects.count(), Skola.objects.count(), 
+                    Resitel.objects.count(), Rocnik.objects.count(), Cislo.objects.count(), 
+                    Problem.objects.count(), Reseni.objects.count()))