Add exercises for ch12

Author: Shehab Abdel-Salam

chapters/chapter05_functions/exercises/exercise_ch5_01.py

@@ -1,7 +1,9 @@
 # Exercise 05_01 - Simple Function
 # Write a function that adds a number by a factor passed as an argument.
 # The factor should have a default value of 1.
-# For example, increment_value_by(5, 3) should return 8 and increment_value_by(5) should return 6.
+# For example
+# increment_value_by(5, 3) should return 8
+# increment_value_by(5) should return 6.
 
 
 # You may need to update the function signature. See tests/test_ch5.py for inspiration.

chapters/chapter07_strings/exercises/exercise_ch7_08.py

@@ -0,0 +1,11 @@
+# Exercise 07_08 - String Compression
+# Write a function that compresses a string using a simple compression algorithm.
+# If a character appears more than once in a row, replace the sequence with
+# the character followed by the number of times it appears.
+# For example, the string "aaabbbbbcc" would be compressed to "a3b5c2".
+
+
+def compress_string(s: str) -> str:
+    # Your code should go here.
+
+    ...

chapters/chapter07_strings/tests/test_ch07.py

@@ -4,6 +4,8 @@
 from ..exercises.exercise_ch7_04 import replace_spaces_with_hyphens
 from ..exercises.exercise_ch7_05 import extract_error_messages
 from ..exercises.exercise_ch7_06 import calculate_product_sales
+from ..exercises.exercise_ch7_07 import find_longest_word
+from ..exercises.exercise_ch7_08 import compress_string
 
 
 def test_ch07_e01():
@@ -93,3 +95,25 @@ def test_ch07_e06():
             "2021-01-03,Banana,300",
         ]
     ) == [("Apple", 300), ("Orange", 450), ("Banana", 450)]
+
+
+def test_ch07_e07():
+    assert find_longest_word("") == ""
+    assert (
+        find_longest_word(["hello", "world", "python", "programming"]) == "programming"
+    )
+    assert (
+        find_longest_word(["hello", "world", "python", "programming", "language"])
+        == "programming"
+    )
+    assert find_longest_word(["I", "am", "learning", "Python"]) == "learning"
+    assert find_longest_word(["Hello", "World"]) == "Hello"
+
+
+def test_ch07_e08():
+    assert compress_string("") == ""
+    assert compress_string("abcd") == "abcd"
+    assert compress_string("aaabbbbbcc") == "a3b5c2"
+    assert compress_string("aabbbcc") == "a2b3c2"
+    assert compress_string("aaaaaabbbc") == "a6b2c"
+    assert compress_string("aadddcccbb") == "a2d3c3b2"

chapters/chapter08_files/exercises/exercise_ch8_04.py

@@ -1,6 +1,34 @@
-# Exercise 08_03 - File Handler
-# Write a custom context manager using a class FileHandler that opens
-# and closes a file. Use it to read from data.txt.
+# Exercise 08_04 - Inventory Management System
+# Write a CSV file containing inventory data and generates a report on stock levels and restock alerts.
+# The CSV file contains columns: item_name, item_id, quantity, and price.
+# Read the CSV file and calculate the total value of the inventory.
+# Identify items with stock levels below the restock threshold and store them in a list.
+# Return a dictionary containing the total inventory value and the list of items that need restocking.
 
+# Example data.csv:
+# item_name,item_id,quantity,price
+# Apple,1,100,0.5
+# Banana,2,200,0.3
+# Orange,3,150,0.4
 
-class FileHandler: ...
+# The function should return:
+
+# {
+#     "total_inventory_value": 140.0,
+#     "restock_alerts": [
+#         {"item_name": "Apple", "item_id": 1, "quantity": 100, "price": 0.5},
+#         {"item_name": "Orange", "item_id": 3, "quantity": 150, "price": 0.4},
+#     ],
+# }
+
+# The restock threshold is 200 items.
+# The total inventory value is calculated as the sum of quantity * price for each item.
+# The restock alerts are items with a quantity below the restock threshold.
+
+
+def inventory_management(
+    file_name: str, restock_threshold: int
+) -> dict[str, list[dict[str, str]]]:
+    # Your code should go here.
+
+    ...

chapters/chapter08_files/exercises/exercise_ch8_05.py

@@ -0,0 +1,6 @@
+# Exercise 08_05 - File Handler
+# Write a custom context manager using a class FileHandler that opens
+# and closes a file. Use it to read from data.txt.
+
+
+class FileHandler: ...

chapters/chapter08_files/tests/test_ch08.py

@@ -5,6 +5,7 @@
 from ..exercises.exercise_ch8_01 import count_errors_from_file
 from ..exercises.exercise_ch8_02 import count_word_frequency
 from ..exercises.exercise_ch8_03 import course_grades_summary
+from ..exercises.exercise_ch8_04 import inventory_management
 
 # from ..exercises.exercise_ch8_04 import FileHandler
 
@@ -126,10 +127,101 @@ def test_ch08_e03(source, expected):
     assert course_grades_summary(source) == expected
 
 
-# TODO: Fix the exercise.
-# def test_ch08_e04(source):
-#     file_handler = FileHandler(source)
-#     file_handler.write("Hello, World!")
-#     assert file_handler.read() == "Hello, World!"
-#     file_handler.close()
-#     assert file_handler.closed
+@pytest.mark.parametrize(
+    "file_content, restock_threshold, expected",
+    [
+        (
+            textwrap.dedent(
+                """
+            """
+            ),
+            0,
+            [],
+        ),
+        (
+            textwrap.dedent(
+                """
+                item_name,item_id,quantity,price
+                Apple,1,100,0.5
+                Banana,2,200,0.3
+                Orange,3,150,0.4
+            """
+            ),
+            200,
+            [
+                {
+                    "item_name": "Apple",
+                    "item_id": 1,
+                    "quantity": 100,
+                    "price": 0.5,
+                },
+                {
+                    "item_name": "Orange",
+                    "item_id": 3,
+                    "quantity": 150,
+                    "price": 0.4,
+                },
+            ],
+        ),
+        (
+            textwrap.dedent(
+                """
+                item_name,item_id,quantity,price
+                Apple,1,100,0.5
+                Banana,2,200,0.3
+                Orange,3,150,0.4
+            """
+            ),
+            100,
+            [
+                {
+                    "item_name": "Apple",
+                    "item_id": 1,
+                    "quantity": 100,
+                    "price": 0.5,
+                },
+            ],
+        ),
+        (
+            textwrap.dedent(
+                """
+                item_name,item_id,quantity,price
+                Apple,1,100,0.5
+                Banana,2,200,0.3
+                Orange,3,150,0.4
+            """
+            ),
+            300,
+            [],
+        ),
+        (
+            textwrap.dedent(
+                """
+                item_name,item_id,quantity,price
+                Apple,1,100,0.5
+                Banana,2,200,0.3
+                Orange,3,150,0.4
+                Pear,4,300,0.6
+                Kiwi,5,400,0.7
+            """
+            ),
+            250,
+            [
+                {
+                    "item_name": "Apple",
+                    "item_id": 1,
+                    "quantity": 100,
+                    "price": 0.5,
+                },
+                {
+                    "item_name": "Orange",
+                    "item_id": 3,
+                    "quantity": 150,
+                    "price": 0.4,
+                },
+            ],
+        ),
+    ],
+)
+def test_ch08_e04(source, restock_threshold, expected):
+    assert inventory_management(source, restock_threshold) == expected

chapters/chapter12_advanced_functions/exercises/exercise_ch12_01.py

@@ -1,7 +1,10 @@
-# Exercise 12.1 - Fibonacci Iterator
-# Write a Python class that implements an iterator for generating the first n Fibonacci numbers.
+# Exercise 12_01 - Even Number Iterator
+# Write a Python class that implements an iterator for generating the first n even numbers.
 
 
-def my_function():
-    # Students will write their solution here
-    return "Hello, World!"
+class EvenNumberIterator:
+    def __init__(self, n: int): ...
+
+    def __iter__(self): ...
+
+    def __next__(self): ...

chapters/chapter12_advanced_functions/exercises/exercise_ch12_02.py

@@ -1,7 +1,10 @@
-# Exercise 12.1 - Generator for Fibonacci Sequence
-# Write a Python generator function to yield Fibonacci numbers up to a specified limit.
+# Exercise 12_01 - Fibonacci Iterator
+# Write a Python class that implements an iterator for generating the first n Fibonacci numbers.
 
 
-def my_function():
-    # Students will write their solution here
-    return "Hello, World!"
+class FibonacciIterator:
+    def __init__(self, n: int): ...
+
+    def __iter__(self): ...
+
+    def __next__(self): ...

chapters/chapter12_advanced_functions/exercises/exercise_ch12_03.py

@@ -1,7 +1,5 @@
-# Exercise 12.1 - Counter Closure
-# Write a Python closure that keeps track of how many times it has been called.
+# Exercise 12_02 - Generator for Even Numbers
+# Write a Python generator to yield the first n even numbers.
 
 
-def my_function():
-    # Students will write their solution here
-    return "Hello, World!"
+def even_numbers_generator(n: int): ...

chapters/chapter12_advanced_functions/exercises/exercise_ch12_04.py

@@ -1,7 +1,5 @@
-# Exercise 12.1 - Counter Closure
-# Create a decorator timer that measures and prints the time taken for a function to execute.
+# Exercise 12_02 - Generator for Fibonacci Sequence
+# Write a Python generator to yield Fibonacci numbers up to a specified limit.
 
 
-def my_function():
-    # Students will write their solution here
-    return "Hello, World!"
+def fibonacci_generator(limit: int): ...