diff --git a/day02.py b/day02.py
index 5aef6fd..9d41a99 100644
--- a/day02.py
+++ b/day02.py
@@ -1,6 +1,7 @@
 import fileinput
 from functools import reduce
 
+
 def main():
     part1 = 0
     part2 = 0
@@ -32,4 +33,5 @@ def main():
 
     print(part1, part2)
 
+
 main()
diff --git a/day04.py b/day04.py
index 34ce9c6..1a5438a 100644
--- a/day04.py
+++ b/day04.py
@@ -1,5 +1,6 @@
 import fileinput
 
+
 def main():
     #
     # Part 1
@@ -24,4 +25,5 @@ def main():
 
     print(part1, part2)
 
+
 main()
diff --git a/day05.py b/day05.py
index fbe3df1..da5a8a9 100644
--- a/day05.py
+++ b/day05.py
@@ -17,9 +17,7 @@ def transform_ranges(map, ranges):
     for start, length in ranges:
         # find the start of the range
         (dst_start, src_start, len) = next(
-            (dst, src, len)
-            for (dst, src, len) in map
-            if src <= start < (src + len)
+            (dst, src, len) for (dst, src, len) in map if src <= start < (src + len)
         )
 
         end = start + length
@@ -53,4 +51,5 @@ def main():
 
     print(part1, part2)
 
+
 main()
diff --git a/day06.py b/day06.py
index 5653393..39a8870 100644
--- a/day06.py
+++ b/day06.py
@@ -1,6 +1,7 @@
 import fileinput
 from math import ceil, floor, sqrt
 
+
 def race(time, dist):
     discr = sqrt(time * time - 4 * dist)
     x1 = (time - discr) / 2
@@ -8,6 +9,7 @@ def race(time, dist):
     x1, x2 = floor(x1) + 1, ceil(x2) - 1
     return x2 - x1 + 1
 
+
 def main():
     input = list(fileinput.input())
     times = [int(x) for x in input[0][11:].split()]
@@ -23,4 +25,5 @@ def main():
 
     print(part1, part2)
 
+
 main()
diff --git a/day07.py b/day07.py
index 4b7ea92..dfc33f6 100644
--- a/day07.py
+++ b/day07.py
@@ -22,6 +22,7 @@ for line in fileinput.input():
     counter = Counter(hand)
     INPUT.append((hand, int(bid), counter["J"], counter.most_common() + [("", 0)]))
 
+
 def solve(part):
     STRENGTHS["J"] = 14 if part == 2 else 4
 
@@ -54,6 +55,7 @@ def solve(part):
     hands.sort(key=lambda h: h[0], reverse=True)
     return sum((i + 1) * bid for (i, (_, bid)) in enumerate(hands))
 
+
 part1 = solve(part=1)
 part2 = solve(part=2)
 print(part1, part2)
diff --git a/day09.py b/day09.py
index efd448c..f89a9ca 100644
--- a/day09.py
+++ b/day09.py
@@ -1,6 +1,7 @@
 import fileinput
 from collections import deque
 
+
 def main():
     part1 = 0
     part2 = 0
@@ -22,4 +23,5 @@ def main():
 
     print(part1, part2)
 
+
 main()
diff --git a/day10.py b/day10.py
index 6dbda21..990bd94 100644
--- a/day10.py
+++ b/day10.py
@@ -68,11 +68,15 @@ print(part1)
 
 side = set()
 for y in range(len(map)):
-    if map[y][0] == ".": side.add((0, y))
-    if map[y][-1] == ".": side.add((len(map[0]) - 1, y))
+    if map[y][0] == ".":
+        side.add((0, y))
+    if map[y][-1] == ".":
+        side.add((len(map[0]) - 1, y))
 for x in range(len(map[0])):
-    if map[0][x] == ".": side.add((x, 0))
-    if map[-1][x] == ".": side.add((x, len(map) - 1))
+    if map[0][x] == ".":
+        side.add((x, 0))
+    if map[-1][x] == ".":
+        side.add((x, len(map) - 1))
 
 mapp = []
 for (x, row) in enumerate(map):
@@ -80,21 +84,21 @@ for (x, row) in enumerate(map):
     for (y, c) in enumerate(row):
         match c:
             case ".":
-                r.append(["..."]*3)
+                r.append(["..."] * 3)
             case "S":
-                r.append([".X.","XXX",".X."])
+                r.append([".X.", "XXX", ".X."])
             case "-":
-                r.append(["...","XXX","..."])
+                r.append(["...", "XXX", "..."])
             case "|":
-                r.append([".X.",".X.",".X."])
+                r.append([".X.", ".X.", ".X."])
             case "7":
-                r.append(["...","XX.",".X."])
+                r.append(["...", "XX.", ".X."])
             case "F":
-                r.append(["...",".XX",".X."])
+                r.append(["...", ".XX", ".X."])
             case "J":
-                r.append([".X.","XX.","..."])
+                r.append([".X.", "XX.", "..."])
             case "L":
-                r.append([".X.",".XX","..."])
+                r.append([".X.", ".XX", "..."])
     mapp.append(r)
 
 bigmap = []
@@ -146,6 +150,6 @@ for y in range(1, len(bigmap), 3):
     for x in range(1, len(bigmap[y]), 3):
         if bigmap[y][x] == "." or (distances[y // 3][x // 3] is None):
             part2 += 1
-            map[y//3][x//3] = 'I'
+            map[y // 3][x // 3] = "I"
 
 print(part1, part2)
diff --git a/day11.py b/day11.py
index 36e1b8a..9ea377b 100644
--- a/day11.py
+++ b/day11.py
@@ -3,6 +3,7 @@ import math
 from pprint import pprint
 from itertools import pairwise
 
+
 def main():
     (part1, part2) = (0, 0)
 
@@ -72,5 +73,6 @@ def main():
 
     print(part1, part2)
 
+
 if __name__ == "__main__":
     main()
diff --git a/day12.py b/day12.py
index eeda91d..83fc49f 100644
--- a/day12.py
+++ b/day12.py
@@ -6,10 +6,12 @@ import re
 
 RE = re.compile(r"[#\?]")
 
+
 def powerset(iterable):
     "powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
     s = list(iterable)
-    return chain.from_iterable(combinations(s, r) for r in range(len(s)+1))
+    return chain.from_iterable(combinations(s, r) for r in range(len(s) + 1))
+
 
 def main():
     (part1, part2) = (0, 0)
@@ -27,8 +29,8 @@ def main():
             if match == groups:
                 part1 += 1
 
-
     print(part1, part2)
 
+
 if __name__ == "__main__":
     main()
diff --git a/day16.py b/day16.py
index 2db0cbd..2a2fce3 100644
--- a/day16.py
+++ b/day16.py
@@ -1,5 +1,6 @@
 import sys
 
+
 def simulate(map, entry):
     seen = set()
     energised = set()
@@ -45,9 +46,10 @@ def simulate(map, entry):
                 stack.append(((x + 1, y), (1, 0)))
             case "\\" if (dx, dy) == (0, -1):
                 stack.append(((x - 1, y), (-1, 0)))
-                
+
     return len(energised)
 
+
 def main():
     with open(sys.argv[1]) as f:
         map = [list(l) for l in f.read().strip().splitlines()]
diff --git a/day17.py b/day17.py
index 5a011dc..38b696c 100644
--- a/day17.py
+++ b/day17.py
@@ -13,7 +13,9 @@ def main() -> None:
 
     pprint(map)
 
-    heap: list[tuple[int, tuple[int, int], int, int, tuple[Any, ...]]] = [(0, (0, 0), 0, 0, ())]
+    heap: list[tuple[int, tuple[int, int], int, int, tuple[Any, ...]]] = [
+        (0, (0, 0), 0, 0, ())
+    ]
     seen = set()
     while heap:
         (cost, (x, y), dir, straight, trace) = heapq.heappop(heap)
@@ -30,9 +32,11 @@ def main() -> None:
         if (0 <= (y + dy) < len(map)) and (0 <= (x + dx) < len(map[y])):
             newtrace = (*trace, (x + dx, y + dy, dir))
             newcost = cost + map[y + dy][x + dx]
-            heapq.heappush(heap, (newcost, (x + dx, y + dy), dir, straight + 1, newtrace))
+            heapq.heappush(
+                heap, (newcost, (x + dx, y + dy), dir, straight + 1, newtrace)
+            )
 
-        newdir = (dir +  1) % 4
+        newdir = (dir + 1) % 4
         (dx, dy) = DIRS[newdir]
         if (0 <= (y + dy) < len(map)) and (0 <= (x + dx) < len(map[y])):
             newtrace = (*trace, (x + dx, y + dy, newdir))
@@ -65,10 +69,6 @@ def main() -> None:
         cost += map[y][x]
     print(cost)
 
+
 if __name__ == "__main__":
     main()
-
-
-
-
-
diff --git a/day17b.py b/day17b.py
index e167f1f..fb5ab68 100644
--- a/day17b.py
+++ b/day17b.py
@@ -32,13 +32,19 @@ def main() -> None:
             break
 
         (dx, dy) = DIRS[dir]
-        if 10 >= (straight + 1) and (0 <= (y + dy) < len(map)) and (0 <= (x + dx) < len(map[y])):
+        if (
+            10 >= (straight + 1)
+            and (0 <= (y + dy) < len(map))
+            and (0 <= (x + dx) < len(map[y]))
+        ):
             newtrace = trace + ((x + dx, y + dy, dir),)
             newcost = cost + map[y + dy][x + dx]
-            heapq.heappush(heap, (newcost, (x + dx, y + dy), dir, straight + 1, newtrace))
+            heapq.heappush(
+                heap, (newcost, (x + dx, y + dy), dir, straight + 1, newtrace)
+            )
 
         if 11 >= (straight + 1) > 4:
-            newdir = (dir +  1) % 4
+            newdir = (dir + 1) % 4
             (dx, dy) = DIRS[newdir]
             if (0 <= (y + dy) < len(map)) and (0 <= (x + dx) < len(map[y])):
                 newtrace = trace + ((x + dx, y + dy, newdir),)
@@ -64,8 +70,9 @@ def main() -> None:
     print("\n".join("".join(line) for line in path))
     print(cost)
 
+
 if __name__ == "__main__":
     main()
 
 # 1040 too low
-# 1066 too high
\ No newline at end of file
+# 1066 too high
diff --git a/day19.py b/day19.py
index 4b3b7ac..38fecba 100644
--- a/day19.py
+++ b/day19.py
@@ -1,12 +1,13 @@
 import sys
 
+
 def part1(workflows: dict[str, list[list[str]]], ratings: str) -> int:
     result = 0
 
     for rating in ratings.splitlines():
         assert [r.split("=")[0] for r in rating[1:-1].split(",")] == list("xmas")
         (x, m, a, s) = (int(r.split("=")[1]) for r in rating[1:-1].split(","))
-        
+
         workflow = "in"
         while workflow not in "RA":
             for rule in workflows[workflow]:
@@ -76,10 +77,11 @@ def part2(workflows: dict[str, list[list[str]]]) -> int:
                             s = (value, s[1])
     return result
 
+
 def main() -> None:
     with open(sys.argv[1]) as f:
         (workflows_, ratings) = f.read().split("\n\n")
-    
+
     workflows = {}
     for workflow in workflows_.splitlines():
         (name, rules_) = workflow.split("{", 1)
@@ -90,5 +92,6 @@ def main() -> None:
     p2 = part2(workflows)
     print(p1, p2)
 
+
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/empty.py b/empty.py
index 5420848..f5cab17 100644
--- a/empty.py
+++ b/empty.py
@@ -1,2 +1,3 @@
 import fileinput
+
 list(fileinput.input())
diff --git a/template.py b/template.py
deleted file mode 100644
index eb710ba..0000000
--- a/template.py
+++ /dev/null
@@ -1,15 +0,0 @@
-import fileinput
-import math
-from pprint import pprint
-
-def main():
-    (part1, part2) = (0, 0)
-
-    inp = fileinput.input()
-    for line in inp:
-        pass
-
-    print(part1, part2)
-
-if __name__ == "__main__":
-    main()