three first days on first try!

d03/part1.py

@@ -0,0 +1,22 @@
+import sys
+
+s = sys.stdin.read()[:-1]
+
+cp = (0,0)
+P = {cp}
+
+dep = {
+    '<':(1,0),
+    '>':(-1,0),
+    'v':(0,1),
+    '^':(0,-1),
+  }
+
+for c in s:
+    x,y = cp
+    dx,dy = dep[c]
+    cp = (x+dx,y+dy)
+    P.add(cp)
+
+print(len(P))
+

d03/part2.py

@@ -0,0 +1,28 @@
+import sys
+
+s = sys.stdin.read()[:-1]
+
+cpS = (0,0)
+cpR = (0,0)
+P = {cpS}
+
+dep = {
+    '<':(1,0),
+    '>':(-1,0),
+    'v':(0,1),
+    '^':(0,-1),
+  }
+
+for i,c in enumerate(s):
+    dx,dy = dep[c]
+    if i%2:
+        x,y = cpS
+        cpS = (x+dx,y+dy)
+        P.add(cpS)
+    else:
+        x,y = cpR
+        cpR = (x+dx,y+dy)
+        P.add(cpR)
+
+print(len(P))
+