Fix url reversing in Python 3

private_storage/storage.py

@@ -3,6 +3,8 @@ Django Storage interface
 """
 from django.core.files.storage import FileSystemStorage
 from django.core.urlresolvers import reverse_lazy
+from django.utils.encoding import force_text
+
 from . import appconfig
 
 __all__ = (
@@ -31,6 +33,11 @@ class PrivateStorage(FileSystemStorage):
             # the attribute is overwritten here to avoid breaking lazy evaluation.
             self.base_url = reverse_lazy('serve_private_file', kwargs={'path': ''})
 
+    def url(self, name):
+        # Make sure reverse_lazy() is evaluated, as Python 3 won't do this here.
+        self.base_url = force_text(self.base_url)
+        return super(PrivateStorage, self).url(name)
+
 
 # Singleton instance.
 private_storage = PrivateStorage()