booleans 3

Inheritance showed that a class can have more than one parent, and the parents are not the same.

Earlier on, I tested if booleans are Integers and the tests showed that False and True are both integers and booleans which begs the question - is bool a child of int or are they both parents of False and True?

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 activate the virtual environment
```
source .venv/bin/activate
```
Attention

on Windows without Windows Subsystem for Linux use .venv/bin/activate.ps1 NOT source .venv/bin/activate
```
.venv/scripts/activate.ps1
```
the terminal shows
```
(.venv) .../pumping_python/booleans
```

I use pytest-watch to run the tests

pytest-watch

the terminal shows

rootdir: .../pumping_python/booleans
collected 4 items

tests/test_booleans.py ....                                      [100%]

============================ 4 passed in X.YZs =============================

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

test_if_bool_is_an_int

RED: make it fail

I add a new test

          self.assertEqual(True/1, 1)

      def test_if_bool_is_an_int(self):
          self.assertIsInstance(bool, int)

  # NOTES

the terminal shows AssertionError

AssertionError: <class 'bool'> is not an instance of <class 'int'>

the bool class is not a child of the int class

GREEN: make it pass

I change assertIsInstance to assertNotIsInstance

      def test_if_bool_is_an_int(self):
          self.assertNotIsInstance(bool, int)

the test passes

review

True and False are booleans
True and False are also integers
bool is NOT a child of the int class, they are different

code from the chapter

Do you want to see all the CODE I typed in this chapter?

what is next?

you have gone through a lot of things and know

Would you like to use one of the class methods with the calculator?

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family ties

how to make a calculator 8