Update for a more general solution.

day-06/solution.py

@@ -21,25 +21,7 @@ def compact(lightList):
 
     return newList
 
-def colsum(lightList):
+def updateState(sliceList, yStart, yEnd, updateFnc):
-    return sum(int(state) * (stop - start + 1) for start, stop, state in lightList)
-
-lights = []
-for x in range(1000):
-    lights.append([(0, 999, False)])
-
-for line in fileinput.input():
-    match = re.search(r"^(toggle|turn (on|off)) (\d+),(\d+) through (\d+),(\d+)$", line)
-
-    xStart = int(match.group(3))
-    yStart = int(match.group(4))
-
-    xEnd = int(match.group(5))
-    yEnd = int(match.group(6))
-
-    command = match.group(1)
-
-    for x in range(xStart, xEnd + 1):
     newList = []
     for start, end, state in lights[x]:
         if not start <= yStart  <= end and not yStart <= start <= yEnd:
@@ -57,14 +39,38 @@ for line in fileinput.input():
             newList.append((yEnd + 1, end, state))
             end = yEnd
 
-            if "toggle" in command:
+        newList.append((start, end, updateFnc(state)))
-                newList.append((start, end, not state))
-            elif "on" in command:
-                newList.append((start, end, True))
-            else:
-                newList.append((start, end, False))
 
-        lights[x] = compact(newList)
+    return compact(newList)
+
+def colsum(lightList):
+    return sum(int(state) * (stop - start + 1) for start, stop, state in lightList)
+
+def getPart1Update(command):
+    if "toggle" in command:
+        return lambda x: not x
+    elif "on" in command:
+        return lambda _: True
+    else:
+        return lambda _: False
+
+lights = []
+for x in range(1000):
+    lights.append([(0, 999, False)])
+
+for line in fileinput.input():
+    match = re.search(r"^(toggle|turn (on|off)) (\d+),(\d+) through (\d+),(\d+)$", line)
+
+    xStart = int(match.group(3))
+    yStart = int(match.group(4))
+
+    xEnd = int(match.group(5))
+    yEnd = int(match.group(6))
+
+    command = match.group(1)
+
+    for x in range(xStart, xEnd + 1):
+        lights[x] = updateState(lights[x], yStart, yEnd, getPart1Update(command))
 
 total = sum(colsum(x) for x in lights)