Quick and dirty day 12.

12.py

@@ -0,0 +1,22 @@
+with open('data/12.txt', 'r') as file:
+    pipes = list(map(lambda l: l.strip().replace(' <-> ', ', ').split(', '), file.readlines()))
+    groups = [set('0')]
+    while len(pipes):
+        for gi, group in enumerate(groups):
+            last_size = 0
+            while len(group) != last_size:
+                last_size = len(group)
+                remove = []
+                for pipeset in pipes:
+                    if any(program in group for program in pipeset):
+                        group = group.union(pipeset)
+                        groups[gi] = group
+                        remove.append(pipeset)
+                for pipeset in remove:
+                    pipes.remove(pipeset)
+        if len(pipes):
+            pipeset = pipes[0]
+            groups.append(set(pipeset))
+            pipes.remove(pipeset)
+    print(f'Part one: {len(groups[0])}')
+    print(f'Part two: {len(groups)}')