【Python】生成某个文件夹的目录树

from pathlib import Path

tree_str = ''
def generate_tree(pathname, n=0):
    global tree_str
    if pathname.is_file():
        tree_str += '    |' * n + '-' * 4 + pathname.name + '\n'
    elif pathname.is_dir():
        tree_str += '    |' * n + '-' * 4 + \
            str(pathname.relative_to(pathname.parent)) + '\\' + '\n'
        for cp in pathname.iterdir():
            generate_tree(cp, n + 1)
        tree_str += '    |' * n + '\n'

if __name__ == '__main__':
    path = '.'
    generate_tree(Path(path), 0)
    print(tree_str)