Now it is clear we want Python 3 only

.gitignore

@@ -1,3 +1,5 @@
 coriplus.sqlite
 __pycache__/
 uploads/
+*.pyc
+**~

README.md

@@ -13,3 +13,9 @@ Based on Tweepee example of [peewee](https://github.com/coleifer/peewee/).
 * Timeline feed
 * In-site notifications
 * SQLite-based app
+
+## Requirements
+
+* **Python 3** only. We don't want to support Python 2.
+* **Flask** web framework.
+* **Peewee** ORM.

app.py

@@ -8,6 +8,11 @@ from functools import wraps
 
 __version__ = '0.4-dev'
 
+# we want to support Python 3 only.
+# Python 2 has too many caveats.
+if sys.version_info[0] < 3:
+    raise RuntimeError('Python 3 required')
+   
 app = Flask(__name__)
 app.config.from_pyfile('config.py')
 
@@ -313,7 +318,7 @@ def unpush_notification(type, target, **kwargs):
 def object_list(template_name, qr, var_name='object_list', **kwargs):
     kwargs.update(
         page=int(request.args.get('page', 1)),
-        pages=qr.count() / 20 + 1)
+        pages=qr.count() // 20 + 1)
     kwargs[var_name] = qr.paginate(kwargs['page'])
     return render_template(template_name, **kwargs)