Upgrade to f-strings with 'flynt .'

dbtemplates/admin.py

@@ -144,7 +144,7 @@ class TemplateAdmin(TemplateModelAdmin):
         for template in queryset:
             valid, error = check_template_syntax(template)
             if not valid:
-                errors.append('{}: {}'.format(template.name, error))
+                errors.append(f'{template.name}: {error}')
         if errors:
             count = len(errors)
             message = ungettext(

dbtemplates/loader.py

@@ -33,7 +33,7 @@ class Loader(BaseLoader):
     def _load_and_store_template(self, template_name, cache_key, site, **params):
         template = Template.objects.get(name__exact=template_name, **params)
         db = router.db_for_read(Template, instance=template)
-        display_name = 'dbtemplates:{}:{}:{}'.format(db, template_name, site.domain)
+        display_name = f'dbtemplates:{db}:{template_name}:{site.domain}'
         return set_and_return(cache_key, template.content, display_name)
 
     def _load_template_source(self, template_name, template_dirs=None):

dbtemplates/management/commands/check_template_syntax.py

@@ -12,7 +12,7 @@ class Command(BaseCommand):
         for template in Template.objects.all():
             valid, error = check_template_syntax(template)
             if not valid:
-                errors.append('{}: {}'.format(template.name, error))
+                errors.append(f'{template.name}: {error}')
         if errors:
             raise CommandError(
                 'Some templates contained errors\n%s' % '\n'.join(errors))

dbtemplates/management/commands/create_error_templates.py

@@ -43,7 +43,7 @@ class Command(BaseCommand):
         verbosity = int(options.get('verbosity', 1))
         for error_code in (404, 500):
             template, created = Template.objects.get_or_create(
-                name="%s.html" % error_code)
+                name=f"{error_code}.html")
             if created or (not created and force):
                 template.content = TEMPLATES.get(error_code, '')
                 template.save()

dbtemplates/management/commands/sync_templates.py

@@ -52,7 +52,7 @@ class Command(BaseCommand):
         delete = options.get('delete')
 
         if not extension.startswith("."):
-            extension = ".%s" % extension
+            extension = f".{extension}"
 
         try:
             site = Site.objects.get_current()
@@ -110,7 +110,7 @@ class Command(BaseCommand):
                                             os.remove(path)
                                         except OSError:
                                             raise CommandError(
-                                                "Couldn't delete %s" % path)
+                                                f"Couldn't delete {path}")
                                 elif confirm == DATABASE_TO_FILES:
                                     with open(path, 'w', encoding='utf-8') as f:
                                         f.write(t.content)

dbtemplates/utils/cache.py

@@ -28,7 +28,7 @@ cache = get_cache_backend()
 
 def get_cache_key(name):
     current_site = Site.objects.get_current()
-    return 'dbtemplates::{}::{}'.format(slugify(name), current_site.pk)
+    return f'dbtemplates::{slugify(name)}::{current_site.pk}'
 
 
 def get_cache_notfound_key(name):