TimCastelijns

visited = [(0, 0)]

with open('day3.txt', 'r') as f:
    s = f.readline()
    x, y = 0, 0
    for direction in s:
        if direction == '>':
            x += 1
        elif direction == '<':
            x -= 1

TimCastelijns

grid = [[False for x in range(1000)] for y in range(1000)]
with open('day6.txt', 'r') as f:
    for line in f.readlines():
        instructions = line.split()
        x1, y1 = (int(i) for i in instructions[-3].split(','))
        x2, y2 = (int(i) for i in instructions[-1].split(','))

        for x, row in enumerate(grid):
            for y, col in enumerate(row):
                if x1 <= x <= x2 and y1 <= y <= y2:

TimCastelijns

nice = 0
with open('day5.txt', 'r') as f:
    for word in f.readlines():
        # 2 overlapping.
        for i in range(0, len(word), 1):
            part = word[i:i+2]
            if word.count(part) >= 2:
                break
        else:
            continue