How to open a file using Numpy's genfromtxt but specifying only part of the directory path?

I would like to open a file located in the directory a/b/foldername_12345678 using genfromtxt. The following works for me

file = np.genfromtxt("a/b/foldername_12345678/filename")

However, I don’t want to keep track of the numbers at the end of the directory path in which the file is located (they are uniquely associated with "foldername"). In other words, I would like to open the file without specifying the full directory path. In linux, I can do this via e.g.

cat a/b/foldername*/filename

How can I do the same with genfromtxt?

>Solution :

You can use wildcards with the glob library.

import numpy as np
import glob

filepath = glob.glob("a/b/foldername*/filename")[0]
file = np.genfromtxt(filepath)

The 0 indexing assumes that there is only one possible file that will be found using this wildcard.