Snippet:

import io
import tarfile
import zipfile
def string2tar(name, bString):
tmpfile = io.BytesIO(bString)
tarinfo = tarfile.TarInfo(name=name)
tarinfo.size=len(bString)
return (tarinfo, tmpfile)
def convert_zip_to_tar(zipname, tarname):
with zipfile.ZipFile(zipname) as zip_file, tarfile.open(tarname, "w|xz") as tar_file:
for zip_file_name in zip_file.namelist():
content = zip_file.read(zip_file_name)
tar_file.addfile(*string2tar(zip_file_name, content))