Updated code for 2019.

movies.kv

@@ -5,20 +5,20 @@ ScreenManager:
             orientation: 'vertical'
             Label:
                 text: 'Enter a movie:'
-                font_size: '24sp'
+                font_size: sp(24)
             BoxLayout:
                 orientation: 'horizontal'
                 Widget:
                 Label:
                     text: 'Movie Title:'
-                    size_hint: (1, None)
+                    size_hint: (1.0, None)
                     height: sp(32)
                 Widget:
                 TextInput:
                     id: title
                     multiline: False
                     write_tab: False
-                    size_hint: (4, None)
+                    size_hint: (4.0, None)
                     height: sp(32)
                 Widget:
             BoxLayout:
@@ -26,14 +26,14 @@ ScreenManager:
                 Widget:
                 Label:
                     text: 'Budget (millions of US dollars):'
-                    size_hint: (1, None)
+                    size_hint: (1.0, None)
                     height: sp(32)
                 Widget:
                 TextInput:
                     id: budget
                     multiline: False
                     write_tab: False
-                    size_hint: (4, None)
+                    size_hint: (4.0, None)
                     height: sp(32)
                 Widget:
             BoxLayout:
@@ -41,14 +41,14 @@ ScreenManager:
                 Widget:
                 Label:
                     text: 'Gross Revenue (millions of US dollars):'
-                    size_hint: (1, None)
+                    size_hint: (1.0, None)
                     height: sp(32)
                 Widget:
                 TextInput:
                     id: gross_revenue
                     multiline: False
                     write_tab: False
-                    size_hint: (4, None)
+                    size_hint: (4.0, None)
                     height: sp(32)
                 Widget:
             Widget:
@@ -57,7 +57,7 @@ ScreenManager:
                 Widget:
                 Button:
                     text: 'Create'
-                    size_hint: (4, 1)
+                    size_hint: (4.0, 1.0)
                     on_press: app.create_movie(title.text, budget.text, gross_revenue.text)
                 Widget:
             BoxLayout:
@@ -66,7 +66,7 @@ ScreenManager:
                 Label:
                     id: message
                     text: ''
-                    size_hint: (None, 1)
+                    size_hint: (None, 1.0)
                     size: self.texture_size
                 Widget:
 
@@ -74,22 +74,22 @@ ScreenManager:
 <Screen>:
     canvas.before:
         Color:
-            rgba: (1, 1, 1, 1)
+            rgba: (1.0, 1.0, 1.0, 1.0)
         Rectangle:
             pos: self.pos
             size: self.size
 
 # All labels are blue.
 <Label>:
-    color: (0, 0, 0.75, 1)
+    color: (0.0, 0.0, 0.75, 1.0)
 
 # All checkboxes are blue.
 <CheckBox>:
     canvas:
         Color:
-            rgba: (0, 0, 0.75, 1)
+            rgba: (0.0, 0.0, 0.75, 1.0)
         Rectangle:
-            source: 'atlas://data/images/defaulttheme/checkbox{radio}{disabled}{on}'.format(radio=('_radio' if self.group else ''), disabled=('_disabled' if self.disabled else ''), on=('_on' if self.active else '_off'))
+            source: f'atlas://data/images/defaulttheme/checkbox{"_radio" if self.group else ""}{"_disabled" if self.disabled else ""}{"_on" if self.active else "_off"}'
             size: sp(32), sp(32)
             pos: int(self.center_x - sp(16)), int(self.center_y - sp(16))
 

movies.py

@@ -43,8 +43,7 @@ class MovieGenre(Persisted):
 class MovieDatabase(object):
     @staticmethod
     def construct_mysql_url(authority, port, database, username, password):
-        return 'mysql+mysqlconnector://{username}:{password}@{authority}:{port}/{database}' \
-            .format(authority=authority, port=port, database=database, username=username, password=password)
+        return f'mysql+mysqlconnector://{username}:{password}@{authority}:{port}/{database}'
 
     @staticmethod
     def construct_in_memory_url():

movies_installer.py

-# -*- coding: utf-8; -*-
-
 from sys import stderr
 
 from datetime import date
@@ -27,7 +25,7 @@ def add_starter_data(session):
     #  2016 October 15
     #  Budget: $25,000,000
     #  Gross Revenue: $206,000,000
-    # Sample review from IMBD:
+    # Sample review from IMDB:
     #  "★★★★★★★★★☆ In the opinion of this reviewer, an extraordinary achievement."
     hidden_figures = Movie(title='Hidden Figures', budget=25000000, gross_revenue=206000000,
                            opening_date=date(2016, 10, 15), genres=[biography, drama, history])
@@ -36,22 +34,23 @@ def add_starter_data(session):
                                        comments='In the opinion of this reviewer, an extraordinary achievement.')
     session.add(extraordinary_achievement)
 
-    # Rogue One (Action, Adventure, SciFi)
-    #  2016 December 16
-    #  Budget: $200,000,000
-    #  Gross Revenue: $1,016,000,000
+    # Avengers: Infinity War (Action, Adventure)
+    #  2018 April 27
+    #  Budget: $300,000,000
+    #  Gross Revenue: $2,048,000,000
     # Sample reviews from IMDB:
-    #  "★★★★★★★★★☆ I feel like the void left in my heart by Episode VII has been filled now."
-    #  "★★★★★☆☆☆☆☆ Ultimately underwhelming."
-    rogue_one = Movie(title='Rogue One', budget=200000000, gross_revenue=1016000000,
-                      opening_date=date(2016, 12, 16), genres=[action, adventure, sci_fi])
-    session.add(rogue_one)
-    void_filled = Review(movie=rogue_one, score=9,
-                         comments='I feel like the void left in my heart by Episode VII has been filled now.')
-    ultimately_underwhelming = Review(movie=rogue_one, score=5,
-                                      comments='Ultimately underwhelming.')
-    session.add(void_filled)
-    session.add(ultimately_underwhelming)
+    #  "★★★★★★★★★★ A summer film that IS even better than the hype."
+    #  "★★★★★★☆☆☆☆ Bordering on a comedy, "Infinity War" is overhyped, lacked direction, but at times impressed."
+    infinity_war = Movie(title='Avengers: Infinity War', budget=300000000, gross_revenue=2048000000,
+                         opening_date=date(2018, 4, 27), genres=[action, adventure])
+    session.add(infinity_war)
+    better_than_hype = Review(movie=infinity_war, score=10,
+                              comments='A summer film that IS even better than the hype.')
+    bordering_on_comedy = Review(movie=infinity_war, score=6,
+                                 comments='Bordering on a comedy, "Infinity War" is overhyped, lacked direction, but '
+                                          'at times impressed.')
+    session.add(better_than_hype)
+    session.add(bordering_on_comedy)
 
 
 def main():
@@ -66,7 +65,7 @@ def main():
         print('Records created.')
     except SQLAlchemyError as exception:
         print('Database setup failed!', file=stderr)
-        print('Cause: {exception}'.format(exception=exception), file=stderr)
+        print(f'Cause: {exception}', file=stderr)
         exit(1)
 
 

test_create_movie.py

@@ -5,6 +5,9 @@ from main import MoviesApp
 
 
 class TestCreateMovie(TestCase):
+    """
+    Four versions of the same test case for a database-modifying method, each with a stronger oracle.
+    """
 
     def test_create_movie_does_not_crash(self):
         url = MovieDatabase.construct_in_memory_url()
@@ -21,7 +24,7 @@ class TestCreateMovie(TestCase):
         session = movie_database.create_session()
         MoviesApp._create_movie(session, 'Example', 4000000, 290000000)
         actual = session.query(Movie).filter(Movie.title == 'Example').one()
-        self.assertIsNotNone(actual)  # not as weak oracle (but still weak)
+        self.assertIsNotNone(actual)  # less-weak oracle (but still weak)
 
     def test_create_movie_inserts_one_movie(self):
         url = MovieDatabase.construct_in_memory_url()
@@ -40,4 +43,4 @@ class TestCreateMovie(TestCase):
         MoviesApp._create_movie(session, 'Example', 4000000, 290000000)
         actual = session.query(Movie).filter(Movie.title == 'Example').one()
         self.assertEqual(actual.budget, 4000000)
-        self.assertEqual(actual.gross_revenue, 290000000)  # better
+        self.assertEqual(actual.gross_revenue, 290000000)  # strong oracle (recommended)