day10.py

#!/bin/python

with open('day10.txt') as f:
    lines = [list(line.strip()) for line in f]

bracketpair = {'(': ')', '[': ']', '{': '}', '<': '>'}
points = {')': 3, ']': 57, '}': 1197, '>': 25137}
scores = {')': 1, ']': 2, '}': 3, '>': 4}
illegal = 0
totalscores = []
for line in lines:
    unclosed = []
    corrupted = False
    for bracket in line:
        if bracket in bracketpair.keys():
            unclosed.append(bracket)
        else:
            if bracket == bracketpair[unclosed[-1]]: 
                unclosed.pop()
            else:
                illegal += points[bracket]
                corrupted = True
                break
    if not corrupted and len(unclosed) > 0:
        missingbrackets = [ bracketpair[bracket] for bracket in reversed(unclosed) ]
        totalscore = 0
        for bracket in missingbrackets:
            totalscore *= 5
            totalscore += scores[bracket]
        totalscores.append(totalscore)

print('Part One:', illegal)
print('Part Two:', sorted(totalscores)[len(totalscores)//2])