Add solutions for day 3 in Python

day_03/python/part_1.py

@@ -0,0 +1,34 @@
+import sys
+
+def find_common(*args):
+	i = set.intersection(*map(set, args))
+	if len(i) == 1:
+		return i.pop()
+	return None
+
+def split_str(s):
+	mid = len(s)//2
+	return (s[:mid], s[mid:])
+
+def determine_priority(letter):
+	v = ord(letter)
+	if 97 <= v <= 122:
+		return v - 96
+	elif 65 <= v <= 90:
+		return v - 38
+
+def run():
+	if len(sys.argv) < 2:
+		print("Not enough arguments")
+		return
+	total = 0
+	with open(sys.argv[1], "r") as f:
+		for line in f:
+			l = line.strip()
+			s1, s2 = split_str(l)
+			x = find_common(s1, s2)
+			total += determine_priority(x)
+	print(f"Sum: {total}")
+
+if __name__ == "__main__":
+	run()

day_03/python/part_2.py

@@ -0,0 +1,31 @@
+import sys
+
+def find_common(*args):
+	i = set.intersection(*map(set, args))
+	if len(i) == 1:
+		return i.pop()
+	return None
+
+def determine_priority(letter):
+	v = ord(letter)
+	if 97 <= v <= 122:
+		return v - 96
+	elif 65 <= v <= 90:
+		return v - 38
+
+def run():
+	if len(sys.argv) < 2:
+		print("Not enough arguments")
+		return
+	total = 0
+	with open(sys.argv[1], "r") as f:
+		for line in f:
+			l = line.strip()
+			l2 = f.readline().strip()
+			l3 = f.readline().strip()
+			x = find_common(l, l2, l3)
+			total += determine_priority(x)
+	print(f"Sum: {total}")
+
+if __name__ == "__main__":
+	run()