Python 3 support

[rnegron]

Django 2.x dropped Python 2 support. Getting the project up and running on Python 3 is a necessary step towards 2.x compatibility!

I ran 2to3 on the repo and obtained the following diff:

--- ./notaso/comments/migrations/0001_initial.py    (original)
+++ ./notaso/comments/migrations/0001_initial.py    (refactored)
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-08-19 16:53
-from __future__ import unicode_literals
+

 import django.db.models.deletion
 from django.conf import settings
--- ./notaso/departments/migrations/0001_initial.py (original)
+++ ./notaso/departments/migrations/0001_initial.py (refactored)
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-08-19 16:52
-from __future__ import unicode_literals
+

 from django.db import migrations, models

--- ./notaso/professors/models.py   (original)
+++ ./notaso/professors/models.py   (refactored)
@@ -39,7 +39,7 @@
     )

     def __unicode__(self):
-        return u"%s %s" % (self.first_name, self.last_name)
+        return "%s %s" % (self.first_name, self.last_name)

     def get_full_name(self):
         full_name = "%s %s" % (self.first_name, self.last_name)
--- ./notaso/professors/migrations/0001_initial.py  (original)
+++ ./notaso/professors/migrations/0001_initial.py  (refactored)
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-08-18 23:33
-from __future__ import unicode_literals
+

 import django.db.models.deletion
 from django.conf import settings
--- ./notaso/universities/models.py (original)
+++ ./notaso/universities/models.py (refactored)
@@ -14,7 +14,7 @@
     slug = models.SlugField(null=False)

     def __unicode__(self):
-        return u"%s %s" % (self.name, self.city)
+        return "%s %s" % (self.name, self.city)

     def save(self, *args, **kwargs):
         self.slug = self.slug.lower()
--- ./notaso/universities/migrations/0001_initial.py    (original)
+++ ./notaso/universities/migrations/0001_initial.py    (refactored)
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-08-19 16:53
-from __future__ import unicode_literals
+

 from django.db import migrations, models

--- ./notaso/users/migrations/0001_initial.py   (original)
+++ ./notaso/users/migrations/0001_initial.py   (refactored)
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-08-18 23:33
-from __future__ import unicode_literals
+

 from django.db import migrations, models

--- ./notaso/users/templatetags/users_extras.py (original)
+++ ./notaso/users/templatetags/users_extras.py (refactored)
@@ -1,5 +1,5 @@
 import hashlib
-import urllib
+import urllib.request, urllib.parse, urllib.error

 from django import template
 from django.conf import settings
@@ -11,7 +11,7 @@
 def gravatar_url(instance, email):
     size = 40
     hash = hashlib.md5(email.lower()).hexdigest()
-    params = urllib.urlencode({"d": "retro", "s": str(size)})
+    params = urllib.parse.urlencode({"d": "retro", "s": str(size)})

     return "{}://www.gravatar.com/avatar/{}?".format(settings.PROTOCOL, hash, params)

It's a start!

[jpadilla]

Nice! Started working on this already on #107