This document discusses socket programming in Python. It covers what sockets are, how to create them in Python, common port numbers and protocols, important socket methods, the roles of clients and servers in communication, and how to transfer Python objects using sockets and the pickle module.

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2. • What are sockets?
• How to achieve Socket Programming in Python?
• Servers and Clients
• Client-Server Communication
• Transferring Python Objects
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4. • Sockets are interior endpoints built for sending
and receiving data
• A single network will have two sockets
• Sockets are a combination of an IP address and a
Port
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5. Protocol Port Number Python Library Function
HTTP 80 httplib, urllib,xmlrpclib Web pages
FTP 20 ftplib, urllib File transfers
NNTP 119 nntplib Unsent news
SMTP 25 smtplib Sending email
Telnet 23 telnetlib Command lines
POP3 110 poplib Fetching email
Gopher 70 gopherlib Document transfer
Common port numbers and the related protocols
Common Port Numbers
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7. • Import the socket module or framework
• This module consists of built-in methods that are
required for creating sockets and help them associate
with each other
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8. Methods Description
socket.socket()
Used to create sockets (required on both server as well as
client ends to create sockets)
socket.accept()
Used to accept a connection. It returns a pair of values (conn,
address)
socket.bind() Used to bind to the address that is specified as a parameter
socket.close() Used to bind to the address that is specified as a parameter
socket.connect() Used to mark the socket as closed
socket.listen()
Used to connect to a remote address specified as the
parameter
Important methods of the socket module
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• Either a program, a computer, or a device
• Devoted to managing network resources
• Can be on the same device or computer or local or even
remote
Server
Client
• Computer or software that receives information or services
• Clients requests for services from servers
• The best example is a web browser
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13. • Socket Programming in Python also
allows you to transfer Python objects
such as sets, tuples, dictionaries, etc.
• To achieve this, you need to import
the pickle module.
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