Python - how do delete content in a complicated folder without changing its structure?

Question

I have a folder with sub-folders, each can contain more sub-folders and so on. I want to delete all the files in all of them, but keeping the directory structure the same. Is there a built-in command or I have to write some recursive function for this using os.listdir?

Answer 1

Shamelessly stolen from the Python Documentation on Files and Directories with the removal of directories omitted:

# Delete everything reachable from the directory named in "top",
# assuming there are no symbolic links.
# CAUTION:  This is dangerous!  For example, if top == '/', it
# could delete all your disk files.
import os
for root, dirs, files in os.walk(top, topdown=False):
    for name in files:
        os.remove(os.path.join(root, name))