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Modern Python Standard Library Cookbook

By : Molina

4.4 (7)

Modern Python Standard Library Cookbook

4.4 (7)

By: Molina

Overview of this book

The Python 3 Standard Library is a vast array of modules that you can use for developing various kinds of applications. It contains an exhaustive list of libraries, and this book will help you choose the best one to address specific programming problems in Python. The Modern Python Standard Library Cookbook begins with recipes on containers and data structures and guides you in performing effective text management in Python. You will find Python recipes for command-line operations, networking, filesystems and directories, and concurrent execution. You will learn about Python security essentials in Python and get to grips with various development tools for debugging, benchmarking, inspection, error reporting, and tracing. The book includes recipes to help you create graphical user interfaces for your application. You will learn to work with multimedia components and perform mathematical operations on date and time. The recipes will also show you how to deploy different searching and sorting algorithms on your data. By the end of the book, you will have acquired the skills needed to write clean code in Python and develop applications that meet your needs.

Preface

Preface

Who this book is for

What this book covers

To get the most out of this book

Sections

Get in touch

Free Chapter

Containers and Data Structures

Containers and Data Structures

Introduction

Counting frequencies

Dictionary with fallback

Unpacking multiple keyword arguments

Ordered dictionaries

MultiDict

Prioritizing entries

Bunch

Enumerations

Text Management

Text Management

Introduction

Pattern matching

Text similarity

Text suggestion

Templating

Splitting strings and preserving spaces

Cleanup text

Normalizing text

Aligning text

Command Line

Command Line

Introduction

Basic logging

Logging to file

Logging to Syslog

Parsing arguments

Interactive shells

Sizing terminal text

Running system commands

Progress bar

Message boxes

Input box

Filesystem and Directories

Filesystem and Directories

Introduction

Traversing folders

Working with paths

Expanding filenames

Getting file information

Named temporary files

Memory and disk buffer

Managing filename encoding

Copying a directory

Safely replacing file's content

Date and Time

Date and Time

Introduction

Time-zone-aware datetime

Parsing dates

Saving dates

From timestamps to datetimes

Displaying dates in user format

Going to tomorrow

Going to next month

Weekdays

Workdays

Combining dates and times

Read/Write Data

Read/Write Data

Introduction

Reading and writing text data

Reading lines of text

Reading and writing binary data

Zipping a directory

Pickling and shelving

Reading configuration files

Writing XML/HTML content

Reading XML/HTML content

Reading and writing CSV

Reading/writing a database

Algorithms

Algorithms

Introduction

Searching, sorting, filtering

Getting the nth element of any iterable

Grouping similar items

Zipping

Flattening a list of lists

Producing permutations and combinations

Accumulating and reducing

Memoizing

Operators to functions

Partials

Generic functions

Proper decoration

Context managers

Applying variable context managers

Cryptography

Cryptography

Introduction

Asking for passwords

Hashing passwords

Verifying a file's integrity

Verifying a message's integrity

Concurrency

Concurrency

Introduction

ThreadPools

Coroutines

Processes

Futures

Scheduled tasks

Sharing data between processes

Networking

Networking

Introduction

Sending emails

Fetching emails

FTP

Sockets

AsyncIO

Remote procedure calls

Web Development

Web Development

Introduction

Treating JSON

Parsing URLs

Consuming HTTP

Submitting forms to HTTP

Building HTML

Serving HTTP

Serving static files

Errors in web applications

Handling forms and files

REST API

Handling cookies

Multimedia

Multimedia

Introduction

Determining the type of a file

Detecting image types

Detecting image sizes

Playing audio/video/images

Graphical User Interfaces

Graphical User Interfaces

Introduction

Alerts

Dialog boxes

ProgressBar dialog

Lists

Menus

Development Tools

Development Tools

Introduction

Debugging

Testing

Mocking

Reporting errors in production

Benchmarking

Inspection

Code evaluation

Tracing code

Profiling

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Parsing arguments

When writing command-line tools, it's usually common to have it change behavior based on options provided to the executable. These options are usually available in sys.argv together with the executable name, but parsing them is not as easy as it might seem, especially when multiple arguments must be supported. Also, when an option is malformed, it's usually a good idea to provide a usage message to inform the user about the right way to use the tool.

How to do it...

Perform the following steps for this recipe:

The argparse.ArgumentParser object is the primary object in charge of parsing command-line options:

import argparse
import operator
import logging
import functools

parser = argparse.ArgumentParser...

Visually different images

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83

Tech Concepts

36

Programming languages

73

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