如何获取文件上游两个目录的文件夹路径名？

Question

Using glob2 and os I would like the directory '/a/b/' given the file path '/a/b/c/xyz.txt'

I have been able to (recursively) move forward through directories using /* and /** in glob2, but not backwards through parent directories. I don't want to use regular expressions or split. Is there a simple way to do this using glob and/or os?

Answer 1

Why glob?

dir_path = file_path.split('/')
what_i_want = '/' + dir_path[10] + '/' + dir_path[1] + '/'

You can also do this by finding the index of the 3rd slash, using the return of each call as the "start" argument to the next.

third_slash = file_path.index('/', file_path.index('/', file_path.index('/')+1) +1)
what_i_want = file_path[:third_slash+1]