truth table

Sometimes I want programs to choose what to do based on inputs or conditions, and can make this happen with if statements. For example

If a person is younger than 18
- the person cannot get a license.
- the person cannot vote.
If a person is 18 or older
- and passes a test, the person can get a license.
- and is a citizen, the person can vote.

These exercises cover writing conditional expressions in Python with the Truth Table from Mathematics and the assertFalse and assertTrue methods.

The operations in these chapters are fundamental to how the computer works. All operations from the Truth Table always return False (which can be thought of as 0) or True (which can be thought of as 1).

start the project

I open a terminal
WSL/Linux/Mac
- I open makePythonTdd.sh
no WSL
- I open makePythonTdd.ps1

I name this project truth_table

WSL/Linux/Mac

I change more_magic to truth_table in makePythonTdd.sh

#!/bin/bash
uv init truth_table
cd truth_table
mkdir tests
touch tests/__init__.py

echo "import unittest


class TestTruthTable(unittest.TestCase):

    def test_failure(self):
        self.assertFalse(True)


# Exceptions seen
# AssertionError
" > tests/test_truth_table.py

echo "pytest" > requirements.txt
echo "pytest-watcher" >> requirements.txt
uv add --requirement requirements.txt
uv run pytest-watcher . --now

I run makePythonTdd.sh in the terminal to make the truth_table project
```
./makePythonTdd.sh
```

no WSL

I change more_magic to truth_table in makePythonTdd.ps1

uv init truth_table
cd truth_table
New-Item "src/truth_table.py"
mkdir tests
New-Item tests/__init__.py

"import unittest


class TestTruthTable(unittest.TestCase):

    def test_failure(self):
        self.assertFalse(True)


# Exceptions seen
# AssertionError
" | Out-File "tests/test_truth_table.py" -Encoding UTF8

"pytest" | Out-File requirements.txt -Encoding UTF8
"pytest-watcher" >> requirements.txt
uv add --requirement requirements.txt
uv run pytest-watcher . --now

I run makePythonTdd.ps1 in the terminal to make the truth_table project
```
.\makePythonTdd.ps1
```

the terminal is my friend, and shows AssertionError

======================== FAILURES =========================
______________ TestTruthTable.test_failure ________________

self = <tests.test_truth_table.TestTruthTable testMethod=test_failure>

    def test_failure(self):
>       self.assertFalse(True)
E       AssertionError: True is not false

tests/test_truth_table.py:7: AssertionError
================ short test summary info ==================
FAILED tests/test_truth_table.py::TestTruthTable::test_failure - AssertionError: True is not false
==================== 1 failed in X.YZs ====================

I hold ctrl (Windows/Linux) or option/command (MacOS) on the keyboard and use the mouse to click on tests/test_truth_table.py:7 to open it

I change True to False in test_truth_table.py

class TestTruthTable(unittest.TestCase):

    def test_failure(self):
        # self.assertFalse(True)
        self.assertFalse(False)


# Exceptions seen

the test passes.

I close test_truth_table.py

WSL/Linux/Mac

I close makePythonTdd.sh

no WSL

I close makePythonTdd.ps1

I open a new terminal then change directory to truth_table
```
cd truth_table
```
I add the new files and folder to git for tracking
```
git add .
```
I add a git commit message
```
git commit -am 'setup project'
```
Click Here to continue to Nullary and Unary Operations

truth table operations

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

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Nullary and Unary Operations