1 files changed, 37 insertions, 0 deletions
diff --git a/challenge-261/packy-anderson/python/ch-2.py b/challenge-261/packy-anderson/python/ch-2.py
new file mode 100755
index 0000000000..fbbf4f535e
--- /dev/null
+++ b/challenge-261/packy-anderson/python/ch-2.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+def multiplyByTwo(ints, start):
+    intSet = frozenset(ints)
+    explain = []
+    step = 0
+
+    while start in intSet:
+        step += 1
+        old = start
+        start *= 2
+        explain.append(
+          f"Step {step}: {old} is in the array " +
+          f"so {old} x 2 = {start}"
+        )
+    explain.append(
+      f"{start} is not in the array so return {start}."
+    )
+    return (start, "\n".join(explain))
+
+def comma_join(arr):
+    return ', '.join(map(lambda i: str(i), arr))
+
+def solution(ints, start):
+    print(f'Input: @ints = ({comma_join(ints)})', end=" ")
+    print(f'and $start = {start}')
+    (output, explain) = multiplyByTwo(ints, start)
+    print(f'Output: {output}\n\n{explain}')
+
+print('Example 1:')
+solution([5,3,6,1,12], 3)
+
+print('\nExample 2:')
+solution([1,2,4,3], 1)
+
+print('\nExample 3:')
+solution([5,6,7], 2)
+\ No newline at end of file