little help in homework required

[JAIDIP patel]

I just wrote the code with Python 3.6.1, I am just a beginner in python.
while compiling having below error, can anyone help me in this

TypeError: a bytes-like object is required, not 'str'


The code I wrote:

import socket

mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
mysock.connect(('data.pr4e.org', 80))
mysock.send('GET http://data.pr4e.org/intro-short.txt HTTP/1.0\n\n')
while True:
    data =x.recv(512)
    if ( len(data) < 1 ) :
        break
    print (data)

mysock.close()