Send list using socket - arrays

Question

I'm trying to send a list from server to client.
The list looks like this (it's a csv file).
201,8,0040000080
205,8,1f421d25721e
but when sending I get this error:
TypeError: must be string or buffer, not list
I tried 2 options:
Iterate through the list and send each string to the server, but got this as a result:
201 ---> 2,0,1
Tried casting each line, e.g str(line), and then send it, but got this:
201,8,0040000080 ---> [,',2,0,1,',",", ,',8,',",", ,',0,0,4,0,0,0,0,0,8,0,',]
how can I solve this? I just want to send the data from the client to server as is. For the record, the Client code:
import socket
import csv
clientSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
with open('can_data.csv', 'rb') as csv_file:
csv_reader = csv.reader(csv_file)
for line in csv_reader:
clientSock.sendto(str(line), (self.address, self.port))
Server code:
with open('output.csv', 'wb') as new_file:
csv_writer = csv.writer(new_file)
while True:
data, addr = s.recvfrom(1024)
csv_writer.writerow(data)

Answer 1

Both sides need to agree on a serialization format. str(line) may work when paired with ast.literaleval() but repr(line) would be the better choice as repr tries for a more precise representation that str. You could also move to a serialization protocol like pickle or json.
Assuming this is python 3, I also moved the csv to text and used utf-8 encoding on the wire.
client:
import socket
import csv
address = 'localhost'
port = 5555
clientSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
with open('can_data.csv', 'r') as csv_file:
csv_reader = csv.reader(csv_file)
for line in csv_reader:
clientSock.sendto(repr(line).encode('utf-8'), (address, port))
server:
import socket
import csv
import ast
address = 'localhost'
port = 5555
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((address, port))
with open('output.csv', 'w') as new_file:
csv_writer = csv.writer(new_file)
while True:
data, addr = sock.recvfrom(1024)
csv_writer.writerow(ast.literal_eval(data.decode('utf-8')))