from tarfile import TarFile
from pathlib import Path


def list_files_gen(root, globbing):
    root = Path(root)
    for path in root.glob(globbing):
        yield path


def tar_gen(filename):
    print('Generator started')
    with TarFile(filename, 'w') as tar:
        while True:
            try:
                print('Before yield')
                file = yield
                print(f'After yield. File: {file}')
            except GeneratorExit:
                print('Generator Exit')
                break
            tar.add(file, recursive=False)
    print('TarFile is closed')


def pack_all(archive, root, globbing):
    tar = tar_gen(archive)
    tar.send(None)
    for file in list_files_gen(root, globbing):
        tar.send(file)
    tar.close()


pack_all('foo.tar.gz', '.', '*.py')

Output:
andre@andre-GP70-2PE:~$ python pack.py 
Generator started
Before yield
After yield. File: viruses.py
Before yield
After yield. File: not_working.py
Before yield
After yield. File: test.py
Before yield
After yield. File: tests.py
Before yield
After yield. File: t.py
Before yield
After yield. File: pack.py
Before yield
Generator Exit
TarFile is closed

Output:
andre@andre-GP70-2PE:~$ tar --list -f foo.tar.gz 
viruses.py
not_working.py
test.py
tests.py
t.py
pack.py