Solution to problem 6 in Python

src/Year_2017/P6.py

@@ -96,5 +96,44 @@ def part_1() -> None:
     print(f"{iteration} cycles must be completed")
 
 
+# --- Part Two ---
+
+# Out of curiosity, the debugger would also like to know the size of the loop:
+# starting from a state that has already been seen, how many block
+# redistribution cycles must be performed before that same state is seen again?
+
+# In the example above, 2 4 1 2 is seen again after four cycles, and so the
+# answer in that example would be 4.
+
+# How many cycles are in the infinite loop that arises from the configuration
+# in your puzzle input?
+
+
+def part_2() -> None:
+    seen = []
+    repeated = False
+    iteration = 0
+    while not repeated:
+        iteration += 1
+        counts = Counter(banks).most_common()
+        # get the most common (tuple)
+        _most_common = counts[0]
+        # reset its key
+        banks[_most_common[0]] = 0
+        for key in cycle_through(
+            banks, int(_most_common[0]) + 1, int(_most_common[1])
+        ):
+            banks[key] += 1
+        _iter = Counter(banks).most_common()
+        if _iter in seen:
+            repeated = True
+        else:
+            if iteration > 1:
+                seen.append(_iter)
+
+    print(f"There are {len(seen)} cycles in the infinite loop")
+
+
 if __name__ == "__main__":
     part_1()
+    part_2()