y_shape.py

from math import ceil, floor

tree_section_length = 16
COLS = 100
ROWS = 63

def gridrow():
    return ['_' for _ in range(COLS)]

def main():

    start_arr = [COLS // 2 - 1]

    idx = 0
    current_sec_length = tree_section_length

    grid = [gridrow() for _ in range(ROWS)]
    for n in range(0, 5):
        current_sec_length = tree_section_length / (2**n)
        # print(current_sec_length)

        # column_phase
        for i in range(int(ceil(current_sec_length))):
            # print(idx, start_arr)
            # print(start_arr)
            for entry in start_arr:
                grid[idx][entry] = '1'
            idx += 1

        # branch_phase
        start_arr = sorted(start_arr + start_arr)
        for i in range(int(floor(current_sec_length))):
            #print(idx, start_arr)
            #idx += 1
            offset = -1
            for j in range(len(start_arr)):
                start_arr[j] = start_arr[j] + offset
                offset *= -1
            # print(start_arr)
            for entry in start_arr:
                grid[idx][entry] = '1'
            idx += 1
    grid = list(reversed(grid))
    for row in grid:
        print(''.join(row))



if __name__ == '__main__':
    main()