day 3 second answer and clean up

03/c.py

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+import os
+
+f = open(os.path.dirname(__file__)+"/input.txt", "r")
+
+tot = 0
+tot2 = 0
+
+priorities = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+commons = ''
+
+rucksacks = f.read().splitlines()
+rucksacks2 = []
+
+for data in rucksacks:
+    left = data[:len(data)//2]
+    right = data[len(data)//2:]
+
+    common = ''.join(set(left).intersection(right))
+
+    tot = tot + priorities.rfind(common)+1
+
+print("First answer: " + str(tot))
+
+start = 0
+end = len(rucksacks)
+step = 3
+for i in range(start, end, step):
+
+    three = rucksacks[i:i+step]
+    common = set(three[0]) & set(three[1]) & set(three[2])
+    tot2 = tot2 + priorities.rfind(''.join(common))+1
+
+print("Second answer: " + str(tot2))