Elegant way to take basename of directory in Python?

Question

I have several scripts that take as input a directory name, and my program creates files in those directories. Sometimes I want to take the basename of a directory given to the

Answer 1

to build the paths without writing slashes it is better to use:

os.path.join(dir, subdir, file)

if you want to add separators or get the separator independly of the os, then use

 os.sep