Solution to problem 15 part 2 in Python

src/P15.py

@@ -71,18 +71,37 @@ for idx, number in enumerate(sequence):
     numbers[number].append(idx)
 
 
-def part_1() -> None:
-    last = list(numbers.keys())[-1]
-    for i in range(len(sequence), 2020):
+def part_1_and_2(num: int) -> None:
+    last = 0  # list(numbers.keys())[-1].copy()
+    for i in range(len(sequence), num):
         if len(numbers[last]) < 2:
             numbers[0].append(i)
             last = 0
         else:
             last = numbers[last][-1] - numbers[last][-2]
             numbers[last].append(i)
+        # because of indexing starts at 0
+        if i == 2019:
+            print(f"The {i+1}th number spoken is {last}")
 
-    print(f"The 2020th number spoken is {last}")
+    print(f"The {num}th number spoken is {last}")
+
+
+# --- Part Two ---
+
+# Impressed, the Elves issue you a challenge: determine the 30000000th number
+# spoken. For example, given the same starting numbers as above:
+
+#     Given 0,3,6, the 30000000th number spoken is 175594.
+#     Given 1,3,2, the 30000000th number spoken is 2578.
+#     Given 2,1,3, the 30000000th number spoken is 3544142.
+#     Given 1,2,3, the 30000000th number spoken is 261214.
+#     Given 2,3,1, the 30000000th number spoken is 6895259.
+#     Given 3,2,1, the 30000000th number spoken is 18.
+#     Given 3,1,2, the 30000000th number spoken is 362.
+
+# Given your starting numbers, what will be the 30000000th number spoken?
 
 
 if __name__ == "__main__":
-    part_1()
+    part_1_and_2(30_000_000)