import subprocess

print("$ nslookup www.python.org")
r=subprocess.call(["nslookup","www.python.org"])
print("Exit code:",r)

print("$ nslookup ")
p=subprocess.Popen(["nslookup"],stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
output,err=p.communicate(b"set q=mx\npython.org\nexit\n")
print(output.decode("utf-8"))
print("Exit code:", p.returncode)