Signature:
socket.send(bytes[, flags])
Parameters:
bytes – The data to be sent in bytes. In case the data is in string format, the encode() method of str can be called to convert it into bytes.
flags – This is an optional parameter. The parameter flags has a default value of 0. The valid values of the flags parameter as supported by the operating system to be used. Multiple flags values are applied bitwise OR and sent.
Overview:
- The send()method of Python's socket class is used to send data from one socket to another socket.
- The send()method can only be used with a connected socket. That is, send() can be used only with a TCP based socket and it can not be used with UDP socket.
- The send() method can be used to send data from a TCP based client socket to a TCP based client-connected socket at the server side and vice versa.
- The data sent should be in bytes format. String data can be converted to bytes by using the encode() method of string class.
Example – A TCP based Client:
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#----- A simple TCP client program in Python using send() function ----- import socket
# Create a client socket clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
# Connect to the server clientSocket.connect(("127.0.0.1",9090));
# Send data to server data = "Hello Server!"; clientSocket.send(data.encode());
# Receive data from server dataFromServer = clientSocket.recv(1024);
# Print to the console print(dataFromServer.decode());
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Output:
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Hello Client! |
Example – A TCP based Server:
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#----- A simple TCP based server program in Python using send() function -----
import socket
# Create a stream based socket(i.e, a TCP socket) # operating on IPv4 addressing scheme serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
# Bind and listen serverSocket.bind(("127.0.0.1",9090)); serverSocket.listen();
# Accept connections while(True): (clientConnected, clientAddress) = serverSocket.accept(); print("Accepted a connection request from %s:%s"%(clientAddress[0], clientAddress[1]));
dataFromClient = clientConnected.recv(1024) print(dataFromClient.decode());
# Send some data back to the client clientConnected.send("Hello Client!".encode()); |
Output:
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Accepted a connection request from 127.0.0.1:54916 Hello Server! |