2 files changed, 95 insertions, 0 deletions
diff --git a/challenge-283/packy-anderson/python/ch-1.py b/challenge-283/packy-anderson/python/ch-1.py
new file mode 100755
index 0000000000..dde2091f5c
--- /dev/null
+++ b/challenge-283/packy-anderson/python/ch-1.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+
+from collections import Counter
+
+def uniqueNumber(ints):
+  bag = Counter(ints)  # count occurrences
+  keys = [
+    k                      # return just the keys
+    for k,v in bag.items() # get key/value pairs
+    if v == 1              # keys that occur once
+  ]
+
+  # invalid input
+  if len(keys) == 0:
+    return 'no element appears only once'
+  if len(keys) > 1:
+    return 'multiple elements appear only once'
+
+  # return the one value
+  return keys.pop(0)
+
+def comma_join(arr):
+    return ', '.join(map(lambda i: str(i), arr))
+
+def solution(ints):
+    print(f'Input: @ints = ({comma_join(ints)})')
+    print(f'Output: {uniqueNumber(ints)}')
+
+print('Example 1:')
+solution([3, 3, 1])
+
+print('\nExample 2:')
+solution([3, 2, 4, 2, 4])
+
+print('\nExample 3:')
+solution([1])
+
+print('\nExample 4:')
+solution([4, 3, 1, 1, 1, 4])
+
+print('\nInvalid Input 1 (no element appears only once):')
+solution([4, 1, 1, 1, 4])
+
+print('\nInvalid Input 2 (multiple elements appear only once):')
+solution([1, 2, 3, 4])
diff --git a/challenge-283/packy-anderson/python/ch-2.py b/challenge-283/packy-anderson/python/ch-2.py
new file mode 100755
index 0000000000..e8ccd8b72c
--- /dev/null
+++ b/challenge-283/packy-anderson/python/ch-2.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+
+from collections import Counter
+
+def digitCountValue(ints):
+  bag = Counter(ints)  # count occurrences
+  explain = []
+  passes = True
+  for digit in range(len(ints)):
+    times  = ints[digit]
+    occurs = bag[digit]
+    otimes = (
+      "0 times"         if occurs == 0 else
+      f"{occurs} times" if occurs >= 2 else
+      "1 time"
+    )
+    if times == occurs:
+      explain.append(
+        f"$ints[{digit}] = {times}, the digit {digit} " +
+        f"occurs {otimes}"
+      )
+    else:
+      passes = False
+      ttimes = (
+        "0 times"        if times == 0 else
+        f"{times} times" if times >= 2 else
+        "1 time"
+      )
+      explain.append(
+        f"$ints[{digit}] = {times}, the digit {digit} " +
+        f"occurs {otimes} rather than {ttimes}"
+      )
+  return passes, "\n".join(explain)
+
+def comma_join(arr):
+  return ', '.join(map(lambda i: str(i), arr))
+
+def solution(ints):
+  print(f'Input: @ints = ({comma_join(ints)})')
+  passes, explain = digitCountValue(ints)
+  print(f'Output: {passes}\n\n{explain}')
+
+print('Example 1:')
+solution([1, 2, 1, 0])
+
+print('\nExample 2:')
+solution([0, 3, 0])
+
+print('\nExample 3:')
+solution([0, 1, 2, 2])