Function that abstracts the access pattern of os.makedirs (run this function on every directory in this directory structure).

for_all_in_path.py

from os import path

def for_all_in_path (name, fun):
    """
    Iterator to run the given function (fun) on each directory in the given path (name).
    
    Example: for_all_in_path("test/adam/example", fun) would call:
    fun("test")
    fun("test/adam")
    fun("test/adam/example")

    """
    head, tail = path.split(name)
    if not tail:
        head, tail = path.split(head)
    if head and tail:
        for_all_in_path(head, fun)
    fun(name)

The code as-is assumes name is a directory. You may want to handle the case where the last component is a file in which it would operate on the file's ancestor directories. The name is also slightly ambiguous as to whether it works on the path components (as it does in this case) or on all the files in the directory. It's less ambiguous as for_all_on_path though still not super intuitive. Looks great otherwise.