Day 8: Add Python solution

08/solution.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+
+import sys
+
+known = {2:1,3:7,4:4,7:8}
+
+silver=0
+gold=0
+
+for l in sys.stdin.readlines():
+    i, o = [x.split() for x in l.rstrip().split(" | ")]
+
+    digits = {}
+    for d in i:
+        k = known.get(len(d))
+        if k:
+            digits[k] = d
+
+    bcdf = set(digits[4])
+    cf = set(digits.get(7) or digits[1])
+    eg = set("abcdefg") - cf - bcdf
+    bd = bcdf - cf
+    out = []
+
+    for d in o:
+        l = len(d)
+        d = set(d)
+        hasbd = len(d & bd) == 2
+        haseg = len(d & eg) == 2
+        if l in known:
+            silver += 1
+            out.append(known[l])
+        elif l == 5:
+            if hasbd:
+                out.append(5)
+            elif haseg:
+                out.append(2)
+            else:
+                out.append(3)
+        elif l == 6:
+            if haseg:
+                if hasbd:
+                    out.append(6)
+                else:
+                    out.append(0)
+            else:
+                out.append(9)
+
+    gold += int("".join([str(i) for i in out]))
+
+print(f"Silver: {silver}\nGold: {gold}")