Added excercise 03- following math and comparisons lesson

Author: razorblade23

exercises/foundations/03_math_and_comparisons/README.md

@@ -0,0 +1,15 @@
+# Exercise 03 - Math and Comparisons
+
+## Description
+Following lesson two on math and comparisons, we will cover essential math skills, some basic string manipulation and comparisons in these tests as well.
+
+Your tasks are described in code comments, but here it is again. **DO NOT** change set values, but replace `None` with how your code should behave.
+
+### Run the tests
+To run the tests, run the following command in the directory root (`python-excercises`):
+```bash
+python check.py 03
+```
+
+## Notes
+Learn about math, string operations and comparisons in [TPL lesson](https://thepythonledger.github.io/Docusaurus-engine/lessons/python-foundations/math-strops-and-comparisons).

exercises/foundations/03_math_and_comparisons/math_and_comparisons.py

@@ -0,0 +1,36 @@
+a = 5
+b = 10
+# Write your code under this comment.
+# Do not change the variables a and b as the tests will fail.
+
+# Replace `None` with the correct mathematical operation
+## Add a and b
+addition = None
+## Substract a from b
+substraction = None
+## Multiply a and b
+multiplication = None
+## Divide a and b
+division = None
+
+
+# Add these two strings together to variable `concated_name`
+f_name = "Jane"
+l_name = "Doe"
+
+concat_name = None
+
+
+# Get some letters from the following string
+shop_name = "My Awesome Shop"
+## Get the first letter
+first_letter = None
+## Get the second last letter
+second_last_letter = None
+
+
+# Convert case on the following string
+hello = "HeLLo AND WelcomE"
+lowercased = None
+uppercased = None
+titlecased = None

exercises/foundations/03_math_and_comparisons/solution/math_and_comparisons_solution.py

@@ -0,0 +1,36 @@
+a = 5
+b = 10
+# Write your code under this comment.
+# Do not change the variables a and b as the tests will fail.
+
+# Replace `None` with the correct mathematical operation
+## Add a and b
+addition = a + b
+## Substract a from b
+substraction = a - b
+## Multiply a and b
+multiplication = a * b
+## Divide a and b
+division = a / b
+
+
+# Add these two strings together to variable `concated_name`
+f_name = "Jane"
+l_name = "Doe"
+
+concat_name = f_name + l_name
+
+
+# Get some letters from the following string
+shop_name = "My Awesome Shop"
+## Get the first letter
+first_letter = shop_name[0]
+## Get the second last letter
+second_last_letter = shop_name[-2]
+
+
+# Convert case on the following string
+hello = "HeLLo AND WelcomE"
+lowercased = hello.lower()
+uppercased = hello.upper()
+titlecased = hello.title()

exercises/foundations/03_math_and_comparisons/solution/test_math_and_comparisons_solution.py

@@ -0,0 +1,29 @@
+def test_basic_math(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(
+        namespace,
+        {"addition": 15, "substraction": -5, "multiplication": 50, "division": 0.5},
+    )
+
+
+def test_string_concat(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(namespace, {"concat_name": "JaneDoe"})
+
+
+def test_string_indexing(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(namespace, {"first_letter": "M", "second_last_letter": "o"})
+
+
+def test_convert_case(run_script, expect_variables):
+    TEST_STRING = "HeLLo AND WelcomE"
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(
+        namespace,
+        {
+            "lowercased": TEST_STRING.lower(),
+            "uppercased": TEST_STRING.upper(),
+            "titlecased": TEST_STRING.title(),
+        },
+    )

exercises/foundations/03_math_and_comparisons/test_math_and_comparisons.py

@@ -0,0 +1,35 @@
+import pytest
+
+
+def test_basic_math(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(
+        namespace,
+        {"addition": 15, "substraction": -5, "multiplication": 50, "division": 0.5},
+    )
+
+
+@pytest.mark.skip(reason="Finish earlier task first")
+def test_string_concat(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(namespace, {"concat_name": "JaneDoe"})
+
+
+@pytest.mark.skip(reason="Finish earlier task first")
+def test_string_indexing(run_script, expect_variables):
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(namespace, {"first_letter": "M", "second_last_letter": "o"})
+
+
+@pytest.mark.skip(reason="Finish earlier task first")
+def test_convert_case(run_script, expect_variables):
+    TEST_STRING = "HeLLo AND WelcomE"
+    _, namespace = run_script("math_and_comparisons_solution.py")
+    expect_variables(
+        namespace,
+        {
+            "lowercased": TEST_STRING.lower(),
+            "uppercased": TEST_STRING.upper(),
+            "titlecased": TEST_STRING.title(),
+        },
+    )

scripts/new_exercise.py

@@ -114,7 +114,7 @@ def next_number(category_dir: Path) -> int:
 
 
 def create_exercise(category_path: str, title: str, style: str) -> None:
-    category_dir = ROOT / category_path
+    category_dir = ROOT / "exercises" / category_path
     category_dir.mkdir(parents=True, exist_ok=True)
 
     func_name = to_snake_case(title)