From 8e5ccf666ca716cc24e05e704da7319c78e2b3de Mon Sep 17 00:00:00 2001
From: Brady James Garvin <bgarvin@cse.unl.edu>
Date: Thu, 29 Jul 2021 12:04:11 -0500
Subject: [PATCH] Condensed examples and included some CPT practice.
---
TESTING.md | 19 +++++++++++++++
example1.kv | 16 ++++++-------
example1.py | 46 +++++++++++++++++++++++++++---------
example2.kv | 27 ---------------------
example2.py | 57 ++++++++++++++++++++-------------------------
example3.kv | 6 -----
example3.py | 41 --------------------------------
test_example2.py | 9 ++++---
test_example3.py | 10 --------
values_installer.py | 15 ++++++++----
10 files changed, 102 insertions(+), 144 deletions(-)
create mode 100644 TESTING.md
delete mode 100644 example3.kv
delete mode 100644 example3.py
delete mode 100644 test_example3.py
diff --git a/TESTING.md b/TESTING.md
new file mode 100644
index 0000000..b12a719
--- /dev/null
+++ b/TESTING.md
@@ -0,0 +1,19 @@
+# Test Design for `example1.Example1App._find_smallest_positive`
+
+## Categories
+
+* …: …, …, …, …
+* …: …, …, …, …
+* …: …, …, …, …
+* …: …, …, …, …
+
+## Initial Test Frames (by CPT)
+
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
+* `entries=[…]` (…, …, …, …)
diff --git a/example1.kv b/example1.kv
index 8e850df..054666d 100644
--- a/example1.kv
+++ b/example1.kv
@@ -1,8 +1,7 @@
BoxLayout:
orientation: 'vertical'
- BoxLayout:
- id: fields
- orientation: 'vertical'
+ Fields:
+ entries: app.entries
size_hint: (1.0, 6.0)
BoxLayout:
orientation: 'horizontal'
@@ -15,18 +14,19 @@ BoxLayout:
font_size: sp(24)
on_press: app.remove_field()
Label:
- id: result
- text: 'Smallest Positive: inf'
+ text: app.result
font_size: sp(24)
+<Fields>:
+ orientation: 'vertical'
+
<Field>:
orientation: 'horizontal'
Label:
- text: root.label_text
+ text: f'Field #{root.index}: '
font_size: sp(24)
TextInput:
- id: input
multiline: False
write_tab: False
font_size: sp(24)
- on_text: app.update()
+ on_text: app.set_entry(root.index, self.text)
diff --git a/example1.py b/example1.py
index f7ee4b1..301c0af 100644
--- a/example1.py
+++ b/example1.py
@@ -2,34 +2,58 @@ from math import inf
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
-from kivy.properties import StringProperty
+from kivy.properties import NumericProperty, StringProperty, ListProperty
class Field(BoxLayout):
- label_text = StringProperty()
+ index = NumericProperty()
+ entry = StringProperty()
+
+
+class Fields(BoxLayout):
+ entries = ListProperty([]) # elements are strings (some may not be valid numbers)
+
+ def rebuild(self):
+ while len(self.children) > len(self.entries):
+ self.remove_widget(self.children[0])
+ while len(self.children) < len(self.entries):
+ self.add_widget(Field(index=len(self.children)))
+
+ def on_entries(self, _, __):
+ self.rebuild()
+ for field, entry in zip(reversed(self.children), self.entries):
+ field.entry = entry
class Example1App(App):
+ entries = ListProperty([]) # elements are strings (some may not be valid numbers)
+ result = StringProperty('Smallest Positive: inf')
+
def add_field(self):
- container = self.root.ids.fields
- container.add_widget(Field(label_text=f'Field #{len(container.children)}: '))
+ self.entries.append('')
def remove_field(self):
- container = self.root.ids.fields
- if len(container.children) > 0:
- container.remove_widget(container.children[0])
+ try:
+ self.entries.pop()
+ except IndexError:
+ pass
def update(self):
- container = self.root.ids.fields
smallest_positive = inf
- for field in container.children:
+ for entry in self.entries:
try:
- value = float(field.ids.input.text)
+ value = float(entry)
if 0 < value < smallest_positive:
smallest_positive = value
except ValueError:
pass
- self.root.ids.result.text = f'Smallest Positive: {smallest_positive}'
+ self.result = f'Smallest Positive: {smallest_positive}'
+
+ def on_entries(self, _, __):
+ self.update()
+
+ def set_entry(self, index, entry):
+ self.entries[index] = entry
if __name__ == '__main__':
diff --git a/example2.kv b/example2.kv
index 2ea9ff2..40deb5f 100644
--- a/example2.kv
+++ b/example2.kv
@@ -1,32 +1,5 @@
BoxLayout:
orientation: 'vertical'
- BoxLayout:
- id: fields
- orientation: 'vertical'
- size_hint: (1.0, 6.0)
- BoxLayout:
- orientation: 'horizontal'
- Button:
- text: 'Add Field'
- font_size: sp(24)
- on_press: app.add_field()
- Button:
- text: 'Remove Field'
- font_size: sp(24)
- on_press: app.remove_field()
Label:
- id: result
text: f'Smallest Positive: {app.smallest_positive}'
font_size: sp(24)
-
-<Field>:
- orientation: 'horizontal'
- Label:
- text: root.label_text
- font_size: sp(24)
- TextInput:
- id: input
- multiline: False
- write_tab: False
- font_size: sp(24)
- on_text: app.update()
diff --git a/example2.py b/example2.py
index 4fbaa09..3bc0c81 100644
--- a/example2.py
+++ b/example2.py
@@ -1,48 +1,41 @@
+from sys import stderr
from math import inf
-from kivy.app import App
-from kivy.uix.boxlayout import BoxLayout
-from kivy.properties import NumericProperty, StringProperty
-
+from sqlalchemy.exc import SQLAlchemyError
+from values import ValueDatabase, Value
-class Field(BoxLayout):
- label_text = StringProperty()
+from kivy.app import App
+from kivy.properties import NumericProperty
class Example2App(App):
smallest_positive = NumericProperty(inf)
- def __init__(self, **kwargs):
- super().__init__(**kwargs)
- self.values = []
-
- def add_field(self):
- container = self.root.ids.fields
- container.add_widget(Field(label_text=f'Field #{len(container.children)}: '))
-
- def remove_field(self):
- container = self.root.ids.fields
- if len(container.children) > 0:
- container.remove_widget(container.children[0])
-
- def _find_smallest_positive(self):
+ @staticmethod
+ def _find_smallest_positive(values):
result = inf
- for value in self.values:
+ for value in values:
if 0 < value < result:
result = value
return result
- def update(self):
- container = self.root.ids.fields
- self.values = []
- for field in container.children:
- try:
- self.values.append(float(field.ids.input.text))
- except ValueError:
- pass
- self.smallest_positive = self._find_smallest_positive()
+ def on_start(self):
+ url = ValueDatabase.construct_mysql_url('localhost', 3306, 'values', 'root', 'cse1208')
+ value_database = ValueDatabase(url)
+ session = value_database.create_session()
+ values = [record.value for record in session.query(Value).all()]
+ self.smallest_positive = Example2App._find_smallest_positive(values)
+
+
+def main():
+ try:
+ app = Example2App()
+ app.run()
+ except SQLAlchemyError as exception:
+ print('Database connection failed!', file=stderr)
+ print(f'Cause: {exception}', file=stderr)
+ exit(1)
if __name__ == '__main__':
- app = Example2App()
- app.run()
+ main()
diff --git a/example3.kv b/example3.kv
deleted file mode 100644
index b315124..0000000
--- a/example3.kv
+++ /dev/null
@@ -1,6 +0,0 @@
-BoxLayout:
- orientation: 'vertical'
- Label:
- id: result
- text: f'Smallest Positive: {app.smallest_positive}'
- font_size: sp(24)
diff --git a/example3.py b/example3.py
deleted file mode 100644
index f6e6627..0000000
--- a/example3.py
+++ /dev/null
@@ -1,41 +0,0 @@
-from sys import stderr
-from math import inf
-
-from sqlalchemy.exc import SQLAlchemyError
-from values import ValueDatabase, Value
-
-from kivy.app import App
-from kivy.properties import NumericProperty
-
-
-class Example3App(App):
- smallest_positive = NumericProperty(inf)
-
- @staticmethod
- def _find_smallest_positive(values):
- result = inf
- for value in values:
- if 0 < value < result:
- result = value
- return result
-
- def on_start(self):
- url = ValueDatabase.construct_mysql_url('localhost', 3306, 'values', 'root', 'cse1208')
- value_database = ValueDatabase(url)
- session = value_database.create_session()
- values = [record.value for record in session.query(Value).all()]
- self.smallest_positive = Example3App._find_smallest_positive(values)
-
-
-def main():
- try:
- app = Example3App()
- app.run()
- except SQLAlchemyError as exception:
- print('Database connection failed!', file=stderr)
- print(f'Cause: {exception}', file=stderr)
- exit(1)
-
-
-if __name__ == '__main__':
- main()
diff --git a/test_example2.py b/test_example2.py
index d401b35..d7c6011 100644
--- a/test_example2.py
+++ b/test_example2.py
@@ -1,11 +1,10 @@
from unittest import TestCase
+from values import ValueDatabase, Value
+
from example2 import Example2App
class TestExample2App(TestCase):
- def test_find_smallest_positive(self):
- app = Example2App()
- app.values = [5.0, 2.0, 4.0]
- actual = app._find_smallest_positive()
- self.assertEqual(actual, 2.0)
+ def test_database_access(self):
+ self.fail()
diff --git a/test_example3.py b/test_example3.py
deleted file mode 100644
index b8be0d3..0000000
--- a/test_example3.py
+++ /dev/null
@@ -1,10 +0,0 @@
-from unittest import TestCase
-
-from values import ValueDatabase, Value
-
-from example3 import Example3App
-
-
-class TestExample3App(TestCase):
- def test_database_access(self):
- self.fail()
diff --git a/values_installer.py b/values_installer.py
index daad20e..afb0f9c 100644
--- a/values_installer.py
+++ b/values_installer.py
@@ -2,7 +2,11 @@ from sys import stderr
from sqlalchemy.exc import SQLAlchemyError
-from values import ValueDatabase, Value
+from values import ValueDatabase, Persisted, Value
+
+
+def already_has_data(session):
+ return any(session.query(table).first() is not None for table in Persisted.metadata.sorted_tables)
def add_starter_data(session):
@@ -21,9 +25,12 @@ def main():
value_database.ensure_tables_exist()
print('Tables created.')
session = value_database.create_session()
- add_starter_data(session)
- session.commit()
- print('Records created.')
+ if already_has_data(session):
+ print('Not creating records because some already exist.')
+ else:
+ add_starter_data(session)
+ session.commit()
+ print('Records created.')
except SQLAlchemyError as exception:
print('Database setup failed!', file=stderr)
print(f'Cause: {exception}', file=stderr)
--
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