Initial data commit

Task/Hailstone-sequence/Python/hailstone-sequence-2.py

@@ -0,0 +1,20 @@
+from itertools import islice
+
+
+def hailstone(n):
+    yield n
+    while n > 1:
+        n = 3 * n + 1 if n & 1 else n // 2
+        yield n
+
+
+if __name__ == '__main__':
+    h = hailstone(27)
+    assert list(islice(h, 4)) == [27, 82, 41, 124]
+    for _ in range(112 - 4 * 2):
+        next(h)
+    assert list(islice(h, 4)) == [8, 4, 2, 1]
+    max_length, n = max((sum(1 for _ in hailstone(i)), i)
+                        for i in range(1, 100_000))
+    print(f"Maximum length {max_length} was found for hailstone({n}) "
+          f"for numbers <100,000")