8. Client and Server Applications | Learning Python Networking

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Learning Python Networking

By : Sam Washington

3.7 (7)

Learning Python Networking

3.7 (7)

By: Sam Washington

Overview of this book

If you're a Python developer or a system administrator with Python experience and you're looking to take your first steps in network programming, then this book is for you. Basic knowledge of Python is assumed.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Network Programming and Python

1. Network Programming and Python

An introduction to TCP/IP networks

Network programming with Python

Breaking a few eggs

Summary

2. HTTP and Working with the Web

2. HTTP and Working with the Web

Request and response

Requests with urllib

Response objects

Status codes

Handling problems

HTTP headers

Customizing requests

Content negotiation

User agents

Cookies

Redirects

URLs

HTTP methods

Formal inspection

HTTPS

The Requests library

Summary

3. APIs in Action

3. APIs in Action

Getting started with XML

The Amazon S3 API

JSON

The Twitter API

HTML and screen scraping

With great power...

Summary

4. Engaging with E-mails

4. Engaging with E-mails

E-mail terminologies

Sending e-mails with SMTP

Sending e-mails securely with TLS

Retrieving e-mails by using POP3 with poplib

Retrieving e-mails by using IMAP with imaplib

Sending e-mail attachments

Sending e-mails via the logging module

Summary

5. Interacting with Remote Systems

5. Interacting with Remote Systems

Secure shell – access using Python

Transferring files through SFTP

Transferring files with FTP

Fetching Simple Network Management Protocol data

Reading Light-weight Directory Access Protocol data

Sharing files with SAMBA

Summary

6. IP and DNS

6. IP and DNS

Retrieving the network configuration of a local machine

Manipulating IP addresses

GeoIP look-ups

NTP clients

Summary

7. Programming with Sockets

7. Programming with Sockets

Basics of sockets

Working with TCP sockets

Working with UDP sockets

TCP port forwarding

A non-blocking socket I/O

Securing sockets with TLS/SSL

Creating a custom SSL client/server

Summary

8. Client and Server Applications

8. Client and Server Applications

Client and server

An echo protocol

A simple echo server

A simple echo client

Concurrent I/O

Multithreading and multiprocessing

A multithreaded echo server

Designing a chat server

A chat protocol

Handling data on persistent connections

A multithreaded chat server

A multithreaded chat client

Event-driven servers

A low-level event-driven chat server

Frameworks

An eventlet-based chat server

An asyncio-based chat server

More on frameworks

Taking our servers forward

Summary

9. Applications for the Web

9. Applications for the Web

What's in a web server?

Python and the Web

Flask – a microframework

Hosting Python web applications

Hosting in practice

Summary

A. Working with Wireshark

A. Working with Wireshark

Packet sniffers

Wireshark

Index

Index

Multithreading and multiprocessing

Python has APIs that allow us to write both multithreading and multiprocessing applications. The principle behind multithreading and multiprocessing is simply to take copies of our code and run them in additional threads or processes. The operating system automatically schedules the threads and processes across available CPU cores to provide fair processing time allocation to all the threads and processes. This effectively allows a program to simultaneously run multiple operations. In addition, when a thread or process blocks, for example, when waiting for IO, the thread or process can be de-prioritized by the OS, and the CPU cores can be allocated to other threads or processes that have actual computation to do.

Here is an overview of how threads and processes relate to each other:

Threads exist within processes. A process can contain multiple threads but it always contains at least one thread, sometimes called the main thread. Threads within the same process...

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83

Tech Concepts

36

Programming languages

73

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