first try

Verifying solution...
Test 1 passed!
Test 2 passed!
Test 3 passed! [Hidden]
Test 4 failed  [Hidden]
Test 5 failed  [Hidden]

extra/power-hungry/solution.py

@@ -0,0 +1,25 @@
+def solution(xs):
+    result = 1
+    max_negative = 0
+    for power in xs:
+        if power == 0:
+            continue
+        result *= power
+        if power < 0:
+            if max_negative == 0:
+                max_negative = power
+            else:
+                max_negative = max(max_negative, power)
+    if max_negative < 0 and result < 0:
+        result /= max_negative
+    return str(result)
+
+tests = [
+        ([2, 0, 2, 2, 0], "8"),
+        ([-2, -3, 4, -5], "60"),
+        ([2, -3, 1, 0, -5], "30"),
+        ]
+
+for i, o in tests:
+    result = solution(i)
+    print (i, result == o, result, o)