Discussion on: Advent of Code 2020 Solution Megathread - Day 3: Toboggan Trajectory

import sys

def slope_calc(data, right, down):
    tree = 0
    open_space = 0
    first = True
    position = right
    line_count = 0

    for line in data:
        if line != "":
            line_read = line.rstrip("\n")
            if first:
                first = False
            else:
                if line_count % down == 0:
                    if line_read[position] == ".":
                        open_space += 1
                    else:
                        if line_read[position] == "#":
                            tree += 1
                    position += right
                    if position > len(line_read)-1:
                        position = position-len(line_read)
        line_count += 1

    print("Tree = {}, Open = {}".format(tree, open_space))
    return tree

data = []
for line in sys.stdin:
    data.append(line.rstrip("\n"))

print(slope_calc(data,1,1) * slope_calc(data,3,1) * slope_calc(data,5,1) * slope_calc(data,7,1) * slope_calc(data,1,2))