retyped day2, completed days 3 and 4, modified template

day3/part1.py

@@ -0,0 +1,22 @@
+from string import ascii_lowercase
+
+
+def parse(filename: str) -> list[tuple[str, str]]:
+    with open(filename) as f:
+        return list(map(lambda x: (x[0 : int((len(x) - 1) / 2)], x[int((len(x) - 1) / 2) : -1]), f.readlines()))
+
+
+def convert(char: str) -> int:
+    return ord(char) - 96 if char in ascii_lowercase else ord(char) - 38
+
+
+def solve(bagpacks: list[tuple[str, str]]) -> int:
+    return sum(map(convert, [(filter(lambda x: x in bagpack[1], bagpack[0])).__next__() for bagpack in bagpacks]))
+
+
+def main():
+    print(solve(parse("input")))
+
+
+if __name__ == "__main__":
+    main()