3 files changed, 126 insertions, 0 deletions
diff --git a/challenge-266/sgreen/python/ch-1.py b/challenge-266/sgreen/python/ch-1.py
new file mode 100755
index 0000000000..bc0372dc4c
--- /dev/null
+++ b/challenge-266/sgreen/python/ch-1.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+from collections import defaultdict
+import sys
+
+
+def uncommon_words(*strings) -> list:
+    """Find words that only occur once in one string, and don't appear in others
+
+    Params:
+        strings: One or more strings
+
+    Returns:
+        list: Words that meat the criteria
+    """
+    freq = defaultdict(int)
+
+    # Compute the frequency of each word
+    for string in strings:
+        for word in string.split(' '):
+            freq[word] += 1
+
+    # Return the word(s) that appear only once
+    return [w for w in freq if freq[w] == 1]
+
+
+def main():
+    result = uncommon_words(*sys.argv[1:])
+
+    if len(result) == 0:
+        # If there is no result, show an empty string
+        print("('')")
+    else:
+        print("('" + "', '".join(result) + "')")
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-266/sgreen/python/ch-2.py b/challenge-266/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..d0df7257ee
--- /dev/null
+++ b/challenge-266/sgreen/python/ch-2.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+import json
+import sys
+
+
+def x_matrix(matrix: list) -> bool:
+    """Determine if the matrix is a X Matrix
+
+    Args:
+        matrix (list): The supplied matrix
+
+    Returns:
+        bool: Wether the matrix as a X Matrix or not
+    """
+    rows = len(matrix)
+
+    # Check we have a square
+    for row in range(rows):
+        if len(matrix[row]) != rows:
+            raise ValueError("Please specify a square matrix")
+
+    # Check that all the values are correct
+    for row in range(rows):
+        for col in range(rows):
+            if col == row or col == rows - 1 - row:
+                # We are expecting a non-zero value
+                if matrix[row][col] == 0:
+                    return False
+            elif matrix[row][col] != 0:
+                # We are expecting a zero value
+                return False
+
+    return True
+
+
+def main():
+    # Parse the matrix from the input
+    matrix = json.loads(sys.argv[1])
+    result = x_matrix(matrix)
+    print('true' if result else 'false')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-266/sgreen/python/test.py b/challenge-266/sgreen/python/test.py
new file mode 100755
index 0000000000..22886bc8d7
--- /dev/null
+++ b/challenge-266/sgreen/python/test.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+import unittest
+ch_1 = __import__('ch-1')
+ch_2 = __import__('ch-2')
+
+
+class TestClass(unittest.TestCase):
+    def test_ch_1(self):
+        self.assertEqual(
+            ch_1.uncommon_words('Mango is sweet', 'Mango is sour'),
+            ['sweet', 'sour']
+        )
+        self.assertEqual(
+            ch_1.uncommon_words('Mango Mango', 'Orange'),
+            ['Orange']
+        )
+        self.assertEqual(
+            ch_1.uncommon_words('Mango is Mango', 'Orange is Orange'),
+            []
+        )
+
+    def test_ch_2(self):
+        self.assertTrue(ch_2.x_matrix([
+            [1, 0, 0, 2],
+            [0, 3, 4, 0],
+            [0, 5, 6, 0],
+            [7, 0, 0, 1],
+        ]))
+        self.assertFalse(ch_2.x_matrix([
+            [1, 2, 3],
+            [4, 5, 6],
+            [7, 8, 9],
+        ]))
+        self.assertTrue(ch_2.x_matrix([
+            [1, 0, 2],
+            [0, 3, 0],
+            [4, 0, 5],
+        ]))
+
+
+if __name__ == '__main__':
+    unittest.main()