booleans 2

I used bool the way I used the assertFalse method in test_what_is_false and the assertTrue method in test_what_is_true while I was refactoring if statements in Truth Table: Binary Operations 1.

I want to practice using bool in test_what_is_true and test_what_is_false.

open the project

  • I change directory to the booleans folder

    cd booleans

    the terminal shows I am in the booleans folder

    .../pumping_python/booleans

  • I use pytest-watcher to run the tests

    uv run pytest-watcher . --now

    the terminal shows

    rootdir: .../pumping_python/booleans
configfile: pyproject.toml
collected 2 items

tests/test_booleans.py ..                                     [100%]

======================== 2 passed in X.YZs =========================

  • I hold ctrl on the keyboard and click on tests/test_booleans.py to open it in the editor

bool at work

RED: make it fail

I add a new assertion to the test_what_is_false method

 6    def test_what_is_false(self):
 7        self.assertIsInstance(False, bool)
 8        self.assertFalse(False)
 9        self.assertFalse(None)
10        self.assertTrue(bool(None))
11        self.assertFalse(0)

the terminal shows AssertionError

AssertionError: False is not true

the result of bool(None) is False

GREEN: make it pass

I change assertTrue to assertFalse

10        self.assertFalse(bool(None))

the test passes

REFACTOR: make it better

  • I add another assertion with bool

     6    def test_what_is_false(self):
 7        self.assertIsInstance(False, bool)
 8        self.assertFalse(False)
 9        self.assertFalse(None)
10        self.assertFalse(bool(None))
11        self.assertFalse(0)
12        self.assertTrue(bool(0))
13        self.assertFalse(0.0)

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change the assertion

    12        self.assertFalse(bool(0))

    the test passes

  • I add an assert method

     6    def test_what_is_false(self):
 7        self.assertIsInstance(False, bool)
 8        self.assertFalse(False)
 9        self.assertFalse(None)
10        self.assertFalse(bool(None))
11        self.assertFalse(0)
12        self.assertFalse(bool(0))
13        self.assertFalse(0.0)
14        self.assertTrue(bool(0.0))
15        self.assertFalse(str())

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change the assertion

    14        self.assertFalse(bool(0.0))

    the test passes

  • I add an assertion

    15        self.assertFalse(str())
16        self.assertTrue(bool(str()))
17        self.assertFalse(tuple())
18        self.assertFalse(list())
19        self.assertFalse(set())
20        self.assertFalse(dict())
21
22    def test_what_is_true(self):

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change assertTrue to assertFalse

    16        self.assertFalse(bool(str()))

    the test passes

  • I add another assertion

    15        self.assertFalse(str())
16        self.assertFalse(bool(str()))
17        self.assertFalse(tuple())
18        self.assertTrue(bool(tuple()))
19        self.assertFalse(list())
20        self.assertFalse(set())
21        self.assertFalse(dict())
22
23    def test_what_is_true(self):

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change the assertion

    18        self.assertFalse(bool(tuple()))

    the test passes

  • I add another line

    15        self.assertFalse(str())
16        self.assertFalse(bool(str()))
17        self.assertFalse(tuple())
18        self.assertFalse(bool(tuple()))
19        self.assertFalse(list())
20        self.assertTrue(bool(list()))
21        self.assertFalse(set())
22        self.assertFalse(dict())
23
24    def test_what_is_true(self):

    the terminal shows AssertionError

    AssertionError: False is not true

  • I make the assertion True

    20    self.assertFalse(bool(list()))

    the test passes

  • I add another line

    19        self.assertFalse(list())
20        self.assertFalse(bool(list()))
21        self.assertFalse(set())
22        self.assertTrue(bool(set()))
23        self.assertFalse(dict())
24
25    def test_what_is_true(self):

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change assertTrue to assertFalse

    22        self.assertFalse(bool(set()))

    the test passes

  • One more

    19        self.assertFalse(list())
20        self.assertFalse(bool(list()))
21        self.assertFalse(set())
22        self.assertFalse(bool(set()))
23        self.assertFalse(dict())
24        self.assertTrue(bool(dict()))
25
26    def test_what_is_true(self):

    the terminal shows AssertionError

    AssertionError: False is not true

  • I change the assertion

     6    def test_what_is_false(self):
 7        self.assertIsInstance(False, bool)
 8        self.assertFalse(False)
 9        self.assertFalse(None)
10        self.assertFalse(bool(None))
11        self.assertFalse(0)
12        self.assertFalse(bool(0))
13        self.assertFalse(0.0)
14        self.assertFalse(bool(0.0))
15        self.assertFalse(str())
16        self.assertFalse(bool(str()))
17        self.assertFalse(tuple())
18        self.assertFalse(bool(tuple()))
19        self.assertFalse(list())
20        self.assertFalse(bool(list()))
21        self.assertFalse(set())
22        self.assertFalse(bool(set()))
23        self.assertFalse(dict())
24        self.assertFalse(bool(dict()))
25
26    def test_what_is_true(self):

    the test passes

more bool at work

Oh No! More of the same thing

RED: make it fail

I add an assertion with bool to test_what_is_true

26    def test_what_is_true(self):
27        self.assertIsInstance(True, bool)
28        self.assertTrue(True)
29        self.assertTrue(-1)
30        self.assertFalse(bool(-1))
31        self.assertTrue(1)
32        self.assertTrue(-0.1)
33        self.assertTrue(0.1)
34        self.assertTrue("text")
35        self.assertTrue((1, 2, 3, 'n'))
36        self.assertTrue([1, 2, 3, 'n'])
37        self.assertTrue({1, 2, 3, 'n'})
38        self.assertTrue({'key': 'value'})
39
40
41# NOTES

the terminal shows AssertionError

AssertionError: True is not false

GREEN: make it pass

I change assertFalse to assertTrue

30        self.assertTrue(bool(-1))

the test passes

REFACTOR: make it better

  • on to the next one

    26    def test_what_is_true(self):
27        self.assertIsInstance(True, bool)
28        self.assertTrue(True)
29        self.assertTrue(-1)
30        self.assertTrue(bool(-1))
31        self.assertTrue(1)
32        self.assertFalse(bool(1))
33        self.assertTrue(-0.1)

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change the assertion

    32        self.assertTrue(bool(1))

    the test passes. The result of bool(1) is True

  • I add another assertion

    26    def test_what_is_true(self):
27        self.assertIsInstance(True, bool)
28        self.assertTrue(True)
29        self.assertTrue(-1)
30        self.assertTrue(bool(-1))
31        self.assertTrue(1)
32        self.assertTrue(bool(1))
33        self.assertTrue(-0.1)
34        self.assertTrue(bool(-0.1))
35        self.assertFalse(0.1)

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change assertFalse to assertTrue

    34        self.assertTrue(bool(-0.1))

    the test passes

  • I add an assertion

    33        self.assertTrue(-0.1)
34        self.assertTrue(bool(-0.1))
35        self.assertTrue(0.1)
36        self.assertFalse(bool(0.1))
37        self.assertTrue("text")
38        self.assertTrue((1, 2, 3, 'n'))
39        self.assertTrue([1, 2, 3, 'n'])
40        self.assertTrue({1, 2, 3, 'n'})
41        self.assertTrue({'key': 'value'})
42
43# NOTES

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change the assertion

    36        self.assertTrue(bool(0.1))

    the test passes

  • I add another one

    33        self.assertTrue(-0.1)
34        self.assertTrue(bool(-0.1))
35        self.assertTrue(0.1)
36        self.assertTrue(bool(0.1))
37        self.assertTrue("text")
38        self.assertFalse(bool("text"))
39        self.assertTrue((1, 2, 3, 'n'))
40        self.assertTrue([1, 2, 3, 'n'])
41        self.assertTrue({1, 2, 3, 'n'})
42        self.assertTrue({'key': 'value'})

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change assertFalse to assertTrue

    38        self.assertTrue(bool("text"))

    the tests passes

  • I add another assertion, when is this going to end?

    37        self.assertTrue("text")
38        self.assertTrue(bool("text"))
39        self.assertTrue((1, 2, 3, 'n'))
40        self.assertFalse(bool((1, 2, 3, 'n')))
41        self.assertTrue([1, 2, 3, 'n'])
42        self.assertTrue({1, 2, 3, 'n'})
43        self.assertTrue({'key': 'value'})

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change assertFalse to assertTrue

    40        self.assertTrue(bool((1, 2, 3, 'n')))

    the test passes

  • another assertion

    37        self.assertTrue("text")
38        self.assertTrue(bool("text"))
39        self.assertTrue((1, 2, 3, 'n'))
40        self.assertTrue(bool((1, 2, 3, 'n')))
41        self.assertTrue([1, 2, 3, 'n'])
42        self.assertFalse(bool([1, 2, 3, 'n']))
43        self.assertTrue({1, 2, 3, 'n'})
44        self.assertTrue({'key': 'value'})

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change the assertion

    42        self.assertTrue(bool([1, 2, 3, 'n']))

    the test passes

  • I add the next assertion

    41        self.assertTrue([1, 2, 3, 'n'])
42        self.assertTrue(bool([1, 2, 3, 'n']))
43        self.assertTrue({1, 2, 3, 'n'})
44        self.assertFalse(bool({1, 2, 3, 'n'}))
45        self.assertTrue({'key': 'value'})
46
47
48# NOTES

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change assertFalse to assertTrue

    44        self.assertTrue(bool({1, 2, 3, 'n'}))

    the test passes

  • I add the last one. Finally!

    41        self.assertTrue([1, 2, 3, 'n'])
42        self.assertTrue(bool([1, 2, 3, 'n']))
43        self.assertTrue({1, 2, 3, 'n'})
44        self.assertTrue(bool({1, 2, 3, 'n'}))
45        self.assertTrue({'key': 'value'})
46        self.assertFalse(bool({'key': 'value'}))
47
48
49# NOTES

    the terminal shows AssertionError

    AssertionError: True is not false

  • I change assertFalse to assertTrue

    26    def test_what_is_true(self):
27        self.assertIsInstance(True, bool)
28        self.assertTrue(True)
29        self.assertTrue(-1)
30        self.assertTrue(bool(-1))
31        self.assertTrue(1)
32        self.assertTrue(bool(1))
33        self.assertTrue(-0.1)
34        self.assertTrue(bool(-0.1))
35        self.assertTrue(0.1)
36        self.assertTrue(bool(0.1))
37        self.assertTrue("text")
38        self.assertTrue(bool("text"))
39        self.assertTrue((1, 2, 3, 'n'))
40        self.assertTrue(bool((1, 2, 3, 'n')))
41        self.assertTrue([1, 2, 3, 'n'])
42        self.assertTrue(bool([1, 2, 3, 'n']))
43        self.assertTrue({1, 2, 3, 'n'})
44        self.assertTrue(bool({1, 2, 3, 'n'}))
45        self.assertTrue({'key': 'value'})
46        self.assertTrue(bool({'key': 'value'}))
47
48
49# NOTES

    the test passes

close the project

  • I close test_booleans.py in the editor

  • I click in the terminal and use q on the keyboard to leave the tests and the terminal goes back to the command line

  • I change directory to the parent of booleans

    cd ..

    the terminal shows

    .../pumping_python

    I am back in the pumping_python directory

review

  • bool(anything) returns True or False

  • assertFalse(anything) checks if the result of bool(anything) is False, it raises AssertionError if it is not

  • assertTrue(anything) checks if the result of bool(anything) is True, it raises AssertionError if it is not

code from the chapter

Do you want to see all the CODE I typed for the Truth Table?

what is next?

Would you like to continue testing binary operations?

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