2 files changed, 69 insertions, 0 deletions
diff --git a/challenge-266/steven-wilson/python/ch-1.py b/challenge-266/steven-wilson/python/ch-1.py
new file mode 100644
index 0000000000..8ed85e183a
--- /dev/null
+++ b/challenge-266/steven-wilson/python/ch-1.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+from collections import Counter
+
+
+def uncommon_words(*sentences):
+    ''' Given  two sentences, find all uncommmon words in any order in the
+    given two sentences. Return ('') if none found.  A word is uncommon if it
+    appears exactly once in one of the sentences and doesn’t appear in other
+    sentence.
+
+    >>> uncommon_words('Mango is sweet', 'Mango is sour')
+    ['sweet', 'sour']
+    >>> uncommon_words('Mango Mango', 'Orange')
+    ['Orange']
+    >>> uncommon_words('Mango is Mango', 'Orange is Orange')
+    ['']
+    '''
+    if not sentences:
+        raise TypeError('Provide at least one sentence.')
+
+    counter = Counter(word for sentence in sentences for word in sentence.split())
+    uncommon = [word for word, count in counter.items() if count == 1]
+    return uncommon if uncommon else ['']
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)
diff --git a/challenge-266/steven-wilson/python/ch-2.py b/challenge-266/steven-wilson/python/ch-2.py
new file mode 100644
index 0000000000..f6603f73a4
--- /dev/null
+++ b/challenge-266/steven-wilson/python/ch-2.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+
+def is_x_matrix(matrix):
+    ''' Given a square matrix, find if the given matrix is X Matrix.  A square
+    matrix is an X Matrix if all the elements on the main diagonal and
+    antidiagonal are non-zero and everything else are zero
+
+    >>> is_x_matrix([[1, 0, 0, 2], [0, 3, 4, 0], [0, 5, 6, 0], [7, 0, 0, 1],])
+    True
+    >>> is_x_matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9],])
+    False
+    >>> is_x_matrix([[1, 0, 2], [0, 3, 0], [4, 0, 5],])
+    True
+    '''
+    matrix_size = len(matrix)
+    diagonal_position = 0
+    for row in matrix:
+        antidiagonal_position = matrix_size - diagonal_position - 1
+        x = []
+        if diagonal_position < antidiagonal_position:
+            x.append(row.pop(antidiagonal_position))
+            x.append(row.pop(diagonal_position))
+        elif diagonal_position == antidiagonal_position:
+            x.append(row.pop(diagonal_position))
+        else:
+            x.append(row.pop(diagonal_position))
+            x.append(row.pop(antidiagonal_position))
+        if not all(elem != 0 for elem in x) or not all(elem == 0 for elem in row):
+            return False
+        diagonal_position += 1
+
+    return True
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)