Cleaned the code using a more functional style

2020/day_6/custom_customs.py

@@ -1,33 +1,29 @@
-with open('input') as f:
-    data = [line.strip() for line in f.read().split('\n\n')]
+from functools import reduce
+
+with open('input') as f:
+    data = [line.strip().split() for line in f.read().split('\n\n')]
+
+def parse_data(data):
+    groups = []
+    for line in data:
+        group = []
+        for answers in line:
+           group.append(set(answers))
+        groups.append(group)
+    return groups
+
+def solve_a(groups):
+    union = lambda a, b: a | b
+    count = lambda g: len(reduce(union, g))
+    return sum(map(count, groups))
 
-def solve_a(data):
-    count = 0
-    for group in data:
-        answers = set()
-        for c in group:
-            if c != '\n':
-                answers.add(c)
-        count += len(answers)
-    return count
 
 def solve_b(data):
-    count = 0
-    for group in data:
-        count_map = {}
-        for c in group:
-            if c == '\n': continue
-            if c in count_map:
-                count_map[c] += 1
-            else:
-                count_map[c] = 1
-        for k in count_map:
-            if count_map[k] == len(group.split()): count += 1
-        print(count_map, count, len(group.split()))
-
-    return count
+    intersection = lambda a, b: a & b
+    count = lambda g: len(reduce(intersection, g))
+    return sum(map(count, groups))
 
 
-print(solve_a(data))
-print(solve_b(data))
-
+groups = parse_data(data)
+print(solve_a(groups))
+print(solve_b(groups))