netcat.py

#!/usr/bin/env python

import socket
import sys

host, port = sys.argv[1:]

host = socket.gethostbyname(host)
port = int(port)

sock = socket.socket()
sock.connect((host, port))
sock.settimeout(1.0)

while True:
    data = sys.stdin.read(64)
    if not data:
        break

    sys.stdout.write(data)

    while data:
        size = sock.send(data)
        data = data[size:]

while True:
    try:
        data = sock.recv(512)
    except socket.timeout:
        break

    if not data:
        break

    sys.stdout.write(data)