demoweb/venv/lib/python3.7/site-packages/twisted/test/process_echoer.py

"""Write back all data it receives."""

import sys

data = sys.stdin.read(1)
while data:
    sys.stdout.write(data)
    sys.stdout.flush()
    data = sys.stdin.read(1)
sys.stderr.write("byebye")
sys.stderr.flush()