Example checking for std in data.

spooled_temporary_file.py

import logging
import sys
from tempfile import SpooledTemporaryFile
try:
    with SpooledTemporaryFile() as temp:
        temp.write(sys.stdin.read())
        logging.debug("tell: %i" % temp.tell())
        if temp.tell() > 0:
            temp.seek(0)
            # do something with the data
except Exception as msg:
    logging.error("could not read stdin:")
    logging.error(msg)