List files & folders in a tree structure and write to text file.

file_tree_view.py

import os
from __future__ import print_function
def list_files(startpath):
    fg = open('structure.txt', 'w+')
    for root, dirs, files in os.walk(startpath):
        level = root.replace(startpath, '').count(os.sep)
        indent = ' ' * 4 * (level)
        a = ('{}|-{}/'.format(indent, os.path.basename(root)))
        print(a)
        fg.write(a)
        subindent = ' ' * 4 * (level + 1)
        for f in files:
            b = ('{}|-{}'.format(subindent, f))
            print(b)
            fg.write(b)

if __name__ == "__main__":
    list_files("") # enter your folder location