2017: Make room for two-digit day numbers

2017/day04.py

@@ -0,0 +1,40 @@
+with open('input/day4') as f:
+    puzzle_input = f.read().splitlines()
+
+def is_valid(passphrase):
+    words = passphrase.split()
+    return len(words) == len(set(words))
+
+def validity_count(passphrases):
+    return len({p for p in passphrases if is_valid(p)})
+
+class Counter:
+    def __init__(self, iterable):
+        self._counts = {}
+        for i in iterable:
+            self._counts[i] = self._counts.get(i, 0) + 1
+
+    def __eq__(self, other):
+        if self._counts.keys() != other._counts.keys():
+            return False
+        for k in self._counts.keys():
+            if self._counts[k] != other._counts[k]:
+                return False
+        return True
+
+def are_anagrams(w1, w2):
+    return Counter(w1) == Counter(w2)
+
+def pairs(l):
+    for i, e1 in enumerate(l):
+        for e2 in l[i+1:]:
+            yield (e1, e2)
+
+def is_valid2(passphrase):
+    return all(not are_anagrams(w1, w2) for w1, w2 in pairs(passphrase.split()))
+
+def validity_count2(passphrases):
+    return len({p for p in passphrases if is_valid2(p)})
+
+print(validity_count(puzzle_input))
+print(validity_count2(puzzle_input))