socket.recvfrom

socket.recvfrom(bufsize)

• This function receives data from a socket
• This refers to a client or server receiving data from the other
• The bufsize limits how much data can be received
• For example, socket.recv(1024) will read at most 1024 bytes
• This function returns a tuple (data, (ipaddress, port))
• The data represents the data received
• The ipaddress and port are the IP address and port number of the sender
• This is useful with datagram sockets
• This is because we can differentiate senders when receiving data from many senders
• It will block I/O if no data has arrived

Example of recvfrom

>>> import socket

>>> sock = socket(AF_INET, SOCK_STREAM)
>>> address = ('', 25000)
>>> sock.bind(address)

>>> client, ad = sock.accept()
>>> data, addr = client.recvfrom(100)
>>> print(data)
'hello world'  # client sent 'hello world' beforehand
>>> print(addr)
('47.229.39.71', '18092')  # client IP address and port

References

• Python Essential Reference
• Documentation for socket API
• Python in a Nutshell
• Is Receiving Data a Blocking Call?