def latest_dataset():
"""Retrive the latest CLDR dataset and provide a ZipFile interface, handling cleanup automatically.
This streams the dataset into a temporary file before wrapping it in the ZipFile interface.
"""
spool = TemporaryFile(prefix='cldr', suffix='.zip')
version, latest = get_latest_version_url()
with Session() as http:
response = http.get(latest, stream=True)
for chunk in response.iter_content(chunk_size=4096):
if chunk: spool.write(chunk)
# Write out any uncommitted data, then return to the beginning.
spool.flush()
spool.seek(0)
zipfile = ZipFile(spool, 'r')
zipfile.version = version # Expose the version number through to consumers of the ZipFile.
yield zipfile
zipfile.close()
spool.close()
