a bytes-like object is required, not 'str'... PYTHON 3

[zepelinmdr]

### CLIENTE
`import socket
import sys

cliente = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
host = "0.0.0.0"
port = 9999

frag =1024

addr = (host,port)

cliente.sendall('1234567')

print("conectado na porta:", port)
f=open('pato.jpg',"rb")

data = f.read(frag)

print("enviando arquivo...")
for i in data:

cliente.sendto(data,addr) 
data = f.read(frag)

cliente.close()
f.close()

`
### SERVER

`import socket
import sys
import select

host="0.0.0.0"
port = 9999
server = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

server.bind((host,port))
frag=1024

addr = (host,port)

while True:

msg = server.recv(1024)

if msg == '1234567':
	server.sendall('ACK')

print("escutando na endereço:", addr[0], "na porta: ", addr[1])
f = open("recebido.jpg","wb")

data,addr = server.recvfrom(frag)

try:

while True: 
	
	f.write(data)
	server.settimeout(3)
	data,addr = server.recvfrom(frag)

except:
f.close()
server.close()

print ("Arquivo baixado")`

I'm trying to create a UDP socket, which has ACK and NACK, but is giving this error "a bytes-like object is required, not 'str'"