3-1.py

import sys


def main(args=()):
    x, y = 0, 0
    total_presents = 1
    visited = {(0, 0),}
    with open('3-1.txt') as f:
        directions = f.read(256)
        while directions:
            for d in directions:
                if d == '<':
                    x -= 1
                elif d == '>':
                    x += 1
                elif d == '^':
                    y -= 1
                elif d == 'v':
                    y += 1

                if ((x, y) not in visited):
                    visited.add((x, y))
                    total_presents += 1
            directions = f.read(256)
    print('Santa delivered %d presents' % total_presents)


if __name__ == '__main__':
    sys.exit(main(sys.argv))