Use / for path on Windows, and have stdlib functions use it as well (glob, os.path, etc.)

Question

How to force Python to use / as path separator (for glob, os.path, etc.), even on Windows?

I tried os.sep = '/' but it does not work:

import os, glob
os.sep = '/'
os.path.sep = '/'

for f in glob.glob('D:/Temp/**/*', recursive=True):
    print(f)
# D:/Temp\New folder
# D:/Temp\New Text Document.txt    

print(os.path.join('D:/', 'Temp', 'hello'))
# D:/Temp\hello

I'd like to avoid "hacks" like having to add .replace('\\', '/') for each path, so linked questions like Why not os.path.join use os.path.sep or os.sep? don't answer it.

I also tried:

import posixpath as path
print(path.normpath(path.join('D:\\Temp', 'hello')))
# D:\Temp/hello    # path.join has correctly use forward slashes

but here \isn't replaced by /.