3 files changed, 80 insertions, 0 deletions
diff --git a/challenge-283/sgreen/python/ch-1.py b/challenge-283/sgreen/python/ch-1.py
new file mode 100755
index 0000000000..7f5ed66cd7
--- /dev/null
+++ b/challenge-283/sgreen/python/ch-1.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+from collections import Counter
+import sys
+
+
+def unique_number(ints: list) -> int:
+    # Calculate the frequency of each integer
+    freq = Counter(ints)
+
+    # Get the integers that appear only once
+    only_once = [i for i in freq if freq[i] == 1]
+
+    if len(only_once) == 1:
+        return only_once[0]
+
+    if len(only_once) == 0:
+        raise ValueError('No values only appear once')
+
+    raise ValueError('More than one value appears once')
+
+
+def main():
+    # Convert input into integers
+    array = [int(n) for n in sys.argv[1:]]
+    result = unique_number(array)
+    print(result)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-283/sgreen/python/ch-2.py b/challenge-283/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..978ad41f6d
--- /dev/null
+++ b/challenge-283/sgreen/python/ch-2.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+from collections import Counter
+import sys
+
+
+def digit_count_value(ints: list) -> bool:
+    # Calculate the frequency of each integer
+    freq = Counter(ints)
+
+    for idx, value in enumerate(ints):
+        # Check the index only appear value number of times
+        if freq[idx] != value:
+            return False
+
+    # Checks pass
+    return True
+
+
+def main():
+    # Convert input into integers
+    array = [int(n) for n in sys.argv[1:]]
+    result = digit_count_value(array)
+    print('true' if result else 'false')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-283/sgreen/python/test.py b/challenge-283/sgreen/python/test.py
new file mode 100755
index 0000000000..9073c9d954
--- /dev/null
+++ b/challenge-283/sgreen/python/test.py
@@ -0,0 +1,21 @@
+#!/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.unique_number([3, 3, 1]), 1)
+        self.assertEqual(ch_1.unique_number([3, 2, 4, 2, 4]), 3)
+        self.assertEqual(ch_1.unique_number([1]), 1)
+        self.assertEqual(ch_1.unique_number([4, 3, 1, 1, 1, 4]), 3)
+
+    def test_ch_2(self):
+        self.assertTrue(ch_2.digit_count_value([1, 2, 1, 0]))
+        self.assertFalse(ch_2.digit_count_value([0, 3, 0]))
+
+
+if __name__ == '__main__':
+    unittest.main()