Book Image

Modern Python Standard Library Cookbook

By : Alessandro Molina
Book Image

Modern Python Standard Library Cookbook

By: Alessandro 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.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Going to next month


Another frequent need when moving dates is to be able to move the date to the next or previous month.

If you read the Going to tomorrow recipe, you will see many similarities with this recipe even though there are some additional changes that are required when working with months that are not needed when working with days, as months have a variable duration.

How to do it...

Perform the following steps for this recipe:

  1. The shiftmonth function will allow us to move our date back and forth by any number of months:
import datetime

def shiftmonth(d, months):
    for _ in range(abs(months)):
        if months > 0:
            d = d.replace(day=5) + datetime.timedelta(days=28)
        else:
            d = d.replace(day=1) - datetime.timedelta(days=1)
    d = d.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
    return d
  1. Using it is as simple as just providing the months you want to add or remove:
>>> now = datetime.datetime.utcnow()
>>> now
datetime...