How to Tar Subdirectories Separately and Use Subdir Name as the Archive Name?

I'm trying to tar all the subdirectories in a directory as separate files and use the subdir name as the file name but I can't get it work.

import os
import tarfile

mypath = "/home/somedir"

def tardir(path):
    for d in os.listdir(path):
        tar_name = d + ".tar.gz"
        print (tar_name)

    for root, dirs, files in os.walk(path):
        for file in files:
            print (file)
            with tarfile.open(tar_name, "w") as tar_handle:
                tar_handle.add(file) 
tardir(mypath)

Here is my final code.

path = "/home/dir/files/test/"

for base, dirs, _ in os.walk(path):
    for d in dirs:
        with tarfile.open(path + d + '.tar.gz', 'w:gz') as tar:
            for _, _, files in os.walk(path + d):
                for f in files:
                    tar.add(os.path.join(path, d, f), arcname= f)