Solutions for day 6.

day6-1.py

@@ -0,0 +1,41 @@
+import fileinput
+import re
+import sys
+
+commandExpr = re.compile(r"^(toggle|turn (on|off)) (\d+),(\d+) through (\d+),(\d+)$")
+
+lights = []
+for x in range(1000):
+    lights.append([])
+    for y in range(1000):
+        lights[x].append(False)
+
+for line in fileinput.input():
+    match = commandExpr.search(line)
+
+    if not match:
+        print "Invalid string"
+        sys.exit(1)
+
+    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):
+        for y in range(yStart, yEnd + 1):
+            if command == "toggle":
+                lights[x][y] = not lights[x][y]
+            elif "on" in command:
+                lights[x][y] = True
+            else:
+                lights[x][y] = False
+
+total = 0
+for row in lights:
+    total += sum([int(i) for i in row])
+
+print total