Socket module, how to send integer

Never send raw data on a stream without defining an upper level protocol saying how to interpret the received bytes.

You can of course send integers in either binary or string format

• in string format, you should define an end of string marker, generally a space or a newline

  val = str(num) + sep # sep = ' ' or sep = `\n`
  tcpsocket.send(val)
  

  and client side:

  buf = ''
  while sep not in buf:
      buf += client.recv(8)
  num = int(buf)
  

• in binary format, you should define a precise encoding, struct module can help

  val = pack('!i', num)
  tcpsocket.send(val)
  

  and client side:

  buf = ''
  while len(buf) < 4:
      buf += client.recv(8)
  num = struct.unpack('!i', buf[:4])[0]
  

Those 2 methods allow you to realiably exchange data even across different architectures

tcpsocket.send(num) accept a string, link to the api, so don't convert the number you insert to int.

I found a super light way to send an integer by socket:

#server side:
num=123
# convert num to str, then encode to utf8 byte
tcpsocket.send(bytes(str(num), 'utf8'))

#client side
data = tcpsocket.recv(1024)
# decode to unicode string 
strings = str(data, 'utf8')
#get the num
num = int(strings)

equally use encode(), decode(), instead of bytes() and str():

#server side:
num=123
# convert num to str, then encode to utf8 byte
tcpsocket.send(str(num).encode('utf8'))

#client side
data = tcpsocket.recv(1024)
# decode to unicode string 
strings = data.decode('utf8')
#get the num
num = int(strings)