Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-246/packy-anderson/python/ch-2.py b/challenge-246/packy-anderson/python/ch-2.py
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+++ b/challenge-246/packy-anderson/python/ch-2.py
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+#!/usr/bin/env python
+
+def findPandQ(a):
+    p = (
+      (a[2] * a[2] - a[1] * a[3])
+      /
+      (a[0] * a[2] - a[1] * a[1])
+    )
+    q = (
+      (a[0] * a[3] - a[2] * a[1])
+      /
+      (a[0] * a[2] - a[1] * a[1])
+    )
+    return(p, q)
+
+
+def isLinearRecurranceOfSecondOrder(a):
+    (p1, q1) = findPandQ(a[0:4])
+    (p2, q2) = findPandQ(a[1:5])
+    if p1 != p2 or q1 != q2:
+        print(f'Values for P ({p1}, {p2}) ', end='')
+        print(f'and Q ({q1}, {q2}) ', end='')
+        print(f'are not consistent across all five elements')
+        return False
+    if p1 != int(p1) or q1 != int(q1):
+        print(f'Values for P ({p1}) ', end='')
+        print(f'and Q ({q1}) ', end='')
+        print(f'for first four elements are not integers')
+        return False
+
+    print(f'Found integer values for P ({int(p1)}) ', end='')
+    print(f'and Q ({int(q1)})')
+    return True
+
+def comma_join(a):
+    return ', '.join(map(str, a))
+
+def solution(a):
+    print(f'Input: @a = ({comma_join(a)})')
+    result = isLinearRecurranceOfSecondOrder(a)
+    print(f'Output: {result}')
+
+print('Example 1:')
+solution([1, 1, 2, 3, 5])
+
+print('\nExample 2:')
+solution([4, 2, 4, 5, 7])
+
+print('\nExample 3:')
+solution([4, 1, 2, -3, 8])
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