First commit with 2 exercises.

.gitignore

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+# Project specific
+test-folder

README.md

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+Here are my solutions and all the tinkering going around [Python Morsels](https://www.pythonmorsels.com/)' exercises.

add/add.py

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+def add(*matrices):
+    get_shape = lambda matrix: [len(vector) for vector in matrix]
+    shape = get_shape(matrices[0])
+    if any(get_shape(matrix) != shape for matrix in matrices):
+        raise ValueError("Given matrices are not the same size.")
+    return [[sum(elt) for elt in zip(*vectors)] for vectors in zip(*matrices)]

add/add_v1.py

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+def add(*matrices):
+    m_sizes = [len(matrix) for matrix in matrices]
+    v_sizes = [len(vectors) for matrix in matrices for vectors in matrix]
+    same_values = lambda l: all(e == l[0] for e in l[1:])
+    if not same_values(m_sizes) or not same_values(v_sizes):
+        raise ValueError("Given matrices are not the same size.")
+    return [[sum(elt) for elt in zip(*vectors)] for vectors in zip(*matrices)]

add/test_add.py

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+from copy import deepcopy
+import unittest
+
+from add import add
+
+
+class AddTests(unittest.TestCase):
+
+    """Tests for add."""
+
+    def test_single_items(self):
+        self.assertEqual(add([[5]], [[-2]]), [[3]])
+
+    def test_two_by_two_matrixes(self):
+        m1 = [[6, 6], [3, 1]]
+        m2 = [[1, 2], [3, 4]]
+        m3 = [[7, 8], [6, 5]]
+        self.assertEqual(add(m1, m2), m3)
+
+    def test_two_by_three_matrixes(self):
+        m1 = [[1, 2, 3], [4, 5, 6]]
+        m2 = [[-1, -2, -3], [-4, -5, -6]]
+        m3 = [[0, 0, 0], [0, 0, 0]]
+        self.assertEqual(add(m1, m2), m3)
+
+    def test_input_unchanged(self):
+        m1 = [[6, 6], [3, 1]]
+        m2 = [[1, 2], [3, 4]]
+        m1_original = deepcopy(m1)
+        m2_original = deepcopy(m2)
+        add(m1, m2)
+        self.assertEqual(m1, m1_original)
+        self.assertEqual(m2, m2_original)
+
+    # To test the Bonus part of this exercise, comment out the following line
+    # @unittest.expectedFailure
+    def test_any_number_of_matrixes(self):
+        m1 = [[6, 6], [3, 1]]
+        m2 = [[1, 2], [3, 4]]
+        m3 = [[2, 1], [3, 4]]
+        m4 = [[9, 9], [9, 9]]
+        m5 = [[31, 32], [27, 24]]
+        self.assertEqual(add(m1, m2, m3), m4)
+        self.assertEqual(add(m2, m3, m1, m1, m2, m4, m1), m5)
+
+    # To test the Bonus part of this exercise, comment out the following line
+    # @unittest.expectedFailure
+    def test_different_matrix_size(self):
+        m1 = [[6, 6], [3, 1]]
+        m2 = [[1, 2], [3, 4], [5, 6]]
+        m3 = [[6, 6], [3, 1, 2]]
+        with self.assertRaises(ValueError):
+            add(m1, m2)
+        with self.assertRaises(ValueError):
+            add(m1, m3)
+        with self.assertRaises(ValueError):
+            add(m1, m1, m1, m3, m1, m1)
+        with self.assertRaises(ValueError):
+            add(m1, m1, m1, m2, m1, m1)
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

circle/circle.py

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+from math import pi
+
+
+class Circle:
+    def __init__(self, radius=1):
+        self.radius = radius
+
+    def __repr__(self):
+        return f"Circle({self.radius})"
+
+    @property
+    def radius(self):
+        return self._radius
+
+    @radius.setter
+    def radius(self, radius):
+        if radius < 0:
+            raise ValueError("Radius cannot be negative")
+        self._radius = radius
+
+    @property
+    def diameter(self):
+        return 2 * self._radius
+
+    @diameter.setter
+    def diameter(self, diameter):
+        if diameter < 0:
+            raise ValueError("Diameter cannot be negative")
+        self._radius = diameter / 2
+
+    @property
+    def area(self):
+        return pi * self._radius ** 2
+
+    @area.setter
+    def area(self, area):
+        raise AttributeError("Can't set attribute")

circle/test_circle.py

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+import math
+import unittest
+
+from circle import Circle
+
+
+class CircleTests(unittest.TestCase):
+
+    """Tests for Circle."""
+
+    def test_radius(self):
+        circle = Circle(5)
+        self.assertEqual(circle.radius, 5)
+
+    def test_default_radius(self):
+        circle = Circle()
+        self.assertEqual(circle.radius, 1)
+
+    def test_diameter(self):
+        circle = Circle(2)
+        self.assertEqual(circle.diameter, 4)
+
+    def test_area(self):
+        circle = Circle(2)
+        self.assertEqual(circle.area, math.pi * 4)
+        circle = Circle(1)
+        self.assertEqual(circle.area, math.pi)
+
+    def test_string_representation(self):
+        circle = Circle(2)
+        self.assertEqual(str(circle), "Circle(2)")
+        self.assertEqual(repr(circle), "Circle(2)")
+        circle.radius = 1
+        self.assertEqual(repr(circle), "Circle(1)")
+
+    # To test the Bonus part of this exercise, comment out the following line
+    # @unittest.expectedFailure
+    def test_diameter_and_area_change_based_on_radius(self):
+        circle = Circle(2)
+        self.assertEqual(circle.diameter, 4)
+        circle.radius = 3
+        self.assertEqual(circle.diameter, 6)
+        self.assertEqual(circle.area, math.pi * 9)
+
+    # To test the Bonus part of this exercise, comment out the following line
+    # @unittest.expectedFailure
+    def test_diameter_changeable_but_area_not(self):
+        circle = Circle(2)
+        self.assertEqual(circle.diameter, 4)
+        self.assertEqual(circle.area, math.pi * 4)
+        circle.diameter = 3
+        self.assertEqual(circle.radius, 1.5)
+        with self.assertRaises(AttributeError):
+            circle.area = 3
+
+    # To test the Bonus part of this exercise, comment out the following line
+    # @unittest.expectedFailure
+    def test_no_negative_radius(self):
+        with self.assertRaises(ValueError) as context:
+            circle = Circle(-2)
+        self.assertEqual(str(context.exception).lower(), "radius cannot be negative")
+        circle = Circle(2)
+        with self.assertRaises(ValueError) as context:
+            circle.radius = -10
+        self.assertEqual(str(context.exception).lower(), "radius cannot be negative")
+        with self.assertRaises(ValueError):
+            circle.diameter = -20
+        self.assertEqual(circle.radius, 2)
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)