master 10.04

requirements.txt

@@ -3,3 +3,4 @@ black == 26.1.0
 pytest == 9.0.2
 pre-commit == 4.5.1
 
+pandas

src/u6_tests/U6_Freitag_testing/bmi.py

@@ -0,0 +1,16 @@
+# Task: Schreibt für die folgende Aufgabe einige Unit-Test. Nutzt dazu für den Happy-Path einen parametrisierten Test für
+# einige valide Inputs und Outputs
+
+
+def calculate_bmi(weight_kg: float, height_m: float) -> float:
+    """
+    Berechnet den Body Mass Index (BMI).
+    BMI = Gewicht (kg) / Grösse (m)^2
+    """
+    if weight_kg <= 0 or height_m <= 0:
+        raise ValueError("Gewicht und Grösse müssen positiv sein.")
+    return weight_kg / (height_m**2)
+
+
+if __name__ == "__main__":
+    print(calculate_bmi(weight_kg=72, height_m=1.84))

src/u6_tests/U6_Freitag_testing/catching_exeptions.py

@@ -0,0 +1,29 @@
+# TASK: Schreibe sinnvolle Tests für die folgende Funktion
+# Schreibe Tests für die korrekte Struktur des Outputs der Funktion
+# Teste, ob bei Übergabe von 'falschem' Parameter data eine Exception geworfen wird
+
+# https://docs.python.org/3/library/exceptions.html
+# Passing arguments of the wrong type (e.g. passing a list when an int is expected) should result in a TypeError,
+# but passing arguments with the wrong value (e.g. a number outside expected boundaries) should result in a ValueError.
+
+
+def double_integers(data: list[int]) -> list[int]:
+    """Doubles a list of given integers
+
+    :param data: list of integers
+    :return: list of doubled integers
+    """
+
+    if not isinstance(data, list):
+        raise TypeError("data must be a list")
+    if not all([isinstance(i, int) for i in data]):
+        raise TypeError("data may contain only integers")
+
+    return [i * 2 for i in data]
+
+
+if __name__ == "__main__":
+
+    data = [1, 2, 3]
+    result = double_integers(data)
+    print(result)

src/u6_tests/U6_Freitag_testing/kata_list_filtering.py

@@ -0,0 +1,14 @@
+# https://www.codewars.com/kata/53dbd5315a3c69eed20002dd
+# level: 7 kyu
+
+# In this kata you will create a function that takes a list of non-negative integers and strings and returns a new
+# list with the strings filtered out.
+#
+# Example
+# filter_list([1,2,'a','b']) == [1,2]
+# filter_list([1,'a','b',0,15]) == [1,0,15]
+# filter_list([1,2,'aasf','1','123',123]) == [1,2,123]
+
+
+def filter_list(list):
+    return [i for i in list if isinstance(i, int)]

src/u6_tests/U6_Freitag_testing/pandas_filter_rows.py

@@ -0,0 +1,37 @@
+# https://www.codewars.com/kata/5ea2baed9345eb001e8ce394
+# 7 kyu
+
+# Input parameters
+
+# dataframe: pandas.DataFrame object
+# col: target column
+# func: filter function
+
+# Task
+# Your function must return a new pandas.DataFrame object with the same columns as the original input. However,
+# include only the rows whose cell values in the designated column evaluate to False by func.
+#
+# Input DataFrame will never be empty. The target column will always be one of the dataframe columns. Filter function
+# will be a valid one. Index value must remain the same.
+
+# REMARK: leichte Modifikation -> es wird ausgegeben, was in der Funktion definiert wurde (True) und nicht umgekehrt.
+
+import pandas as pd
+
+
+def filter_dataframe(df, col, func):
+    if col not in df.columns:
+        raise ValueError(f"Column '{col}' is not present in the DataFrame.")
+    mask = df[col].apply(func)
+    return df[mask]
+
+
+if __name__ == "__main__":
+
+    df = pd.DataFrame(
+        {
+            "A": [1, 2, 3, 4, 5],
+        }
+    )
+
+    print(filter_dataframe(df, "A", lambda x: x >= 4))

src/u6_tests/U6_Freitag_testing/vowel_count.py

@@ -0,0 +1,18 @@
+# https://www.codewars.com/kata/54ff3102c1bad923760001f3
+# level: 7 kyu
+
+# Return the number (count) of vowels in the given string.
+# We will consider a, e, i, o, u as vowels for this Kata (but not y).
+# The input string will only consist of lower case letters and/or spaces.
+
+
+def get_count(inputStr):
+    num_vowels = 0
+    for char in inputStr:
+        if char in "aeiouAEIOU":
+            num_vowels = num_vowels + 1
+    return num_vowels
+
+
+if __name__ == "__main__":
+    print(get_count("Hello World"))

src/u6_tests/pricing.py

@@ -1,4 +1,9 @@
 def discount_price(price: float, percent: float) -> float:
+    if percent < 0:
+        raise ValueError("Discount percent cannot be negative")
+    if percent >= 100:
+        raise ValueError("Percent must be between 0% and 100%")
+
     return price - price * percent / 100
 
 

tests/test_pricing.py

@@ -4,3 +4,11 @@ from src.u6_tests.pricing import discount_price
 def test_discount_price_reduces_price():
     result = discount_price(100.0, 20.0)
     assert result == 80.0
+
+
+def test_discount_price_negative_discount():
+    try:
+        discount_price(100.0, -20.0)
+        assert False, "Expected ValueError"
+    except ValueError as e:
+        assert str(e) == "Discount percent cannot be negative"

tests/test_u6_catching_exceptions.py

@@ -0,0 +1,18 @@
+from src.u6_tests.U6_Freitag_testing.catching_exeptions import double_integers
+import pytest
+
+
+def test_double_integers_with_invalid_input():
+    with pytest.raises(TypeError):
+        double_integers("not a list")
+
+    with pytest.raises(TypeError):
+        double_integers([1, 2, "not an int"])
+
+
+@pytest.mark.parametrize(
+    "input_data, expected_output",
+    [([1, 2, 3], [2, 4, 6]), ([0, -1, -2], [0, -2, -4]), ([], [])],
+)
+def test_double_integers(input_data, expected_output):
+    assert double_integers(input_data) == expected_output

tests/test_u6_kata_list_filtering.py

@@ -0,0 +1,47 @@
+import pytest
+
+from src.u6_tests.U6_Freitag_testing.kata_list_filtering import filter_list
+
+
+def test_filter_list_with_mixed_types():
+    result = filter_list([1, 2, "a", "b"])
+    assert result == [1, 2]
+
+
+def test_filter_list_with_only_strings():
+    result = filter_list(["a", "b", "c"])
+    assert result == []
+
+
+def test_filter_list_with_only_integers():
+    result = filter_list([1, 2, 3])
+    assert result == [1, 2, 3]
+
+
+def test_filter_list_output_is_list():
+    result = filter_list([1, "a", 2])
+    assert isinstance(result, list)
+
+
+def test_filter_list_assert_length():
+
+    l1 = [1, "a", 2, "b", 3]
+    l2 = [1, 2, 3]
+    l3 = [1 / 2, "a", 2.5, "b", 3]
+
+    result1 = filter_list(l1)
+    result2 = filter_list(l2)
+    result3 = filter_list(l3)
+
+    assert len(result1) == 3
+    assert len(result2) == 3
+    assert len(result3) == 1
+
+
+@pytest.mark.parametrize(
+    "input_list, expected_length",
+    [([1, "a", 2, "b", 3], 3), ([1, 2, 3], 3), ([1 / 2, "a", 2.5, "b", 3], 1)],
+)
+def test_filter_list_parametrized(input_list, expected_length):
+    result = filter_list(input_list)
+    assert len(result) == expected_length