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Python Automation Cookbook
Python Automation Cookbook

Python Automation Cookbook: 75 Python automation recipes for web scraping; data wrangling; and Excel, report, and email processing , Second Edition

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Profile Icon Jaime Buelta
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€32.99
Paperback May 2020 526 pages 2nd Edition
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Arrow left icon
Profile Icon Jaime Buelta
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€32.99
Paperback May 2020 526 pages 2nd Edition
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€17.99 €26.99
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Renews at €18.99p/m
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Python Automation Cookbook

Automating Tasks Made Easy

To properly automate tasks, we need a way to make them execute automatically at the proper times. A task that needs to be started manually is not really fully automated.

However, in order to be able to leave them running in the background while worrying about more pressing issues, the task will need to be adequate to run in fire-and-forget mode. We should be able to monitor that it executes correctly, be sure that we capture relevant information (such as receiving notifications if something interesting arises), and know whether there have been any errors while running it.

Ensuring that a piece of software runs consistently with high reliability is actually a very big deal. It is one area that, in order to be done properly, requires specialized knowledge and staff, who typically go by the names of sysadmin, operations, or SRE (Site Reliability Engineering). Big operations, such as Amazon and Google, require huge investment in ensuring...

Preparing a task

It all starts with defining precisely the work that needs to be executed, and designing it in a way that doesn't require human intervention to run.

Some ideal characteristic points are as follows:

  1. Single, clear entry point: No confusion on how to start the task.
  2. Clear parameters: If there are any parameters, they should be as explicit as possible.
  3. No interactivity: Stopping the execution to request information from the user is not possible.
  4. The result should be stored: In order to be checked at a different time than when it runs.
  5. Clear result: When we oversee the execution of a program ourselves, we can accept more verbose results, such as unlabeled data or extra debugging information. However, for an automated task, the final result should be as concise and to the point as possible.
  6. Errors should be logged: To analyze what went wrong.

A command-line program has a lot of those characteristics already...

Setting up a cron job

Cron is an old-fashioned but reliable way of executing commands. It has been around since the 1970s in Unix, and it's an old favorite in system administration to perform maintenance tasks such as freeing up disk space, rotating log files, making backups, and other common, repetitive operations.

This recipe is Unix and Unix-like operating systems specific, so it will work in Linux and macOS. While it's possible to schedule a task in Windows, it's very different and uses Task Scheduler, which won't be described here. If you have access to a Linux server, this can be a good way of scheduling periodic tasks.

The main advantages are as follows:

  • It's present in virtually all Unix or Linux systems and configured to run automatically.
  • It's easy to use, although a little deceptive at first.
  • It's well known. Almost anyone involved with admin tasks will have a general idea of how to use it.
  • It allows...

Capturing errors and problems

An automated task's main characteristic is its fire-and-forget quality. We are not actively looking at the result, but making it run in the background.

Most of the recipes in this book deal with external information, such as web pages or other reports, so the likelihood of finding an unexpected problem when running it is high. This recipe will present an automated task that will safely store unexpected behaviors in a log file that can be checked afterward.

Getting ready

As a starting point, we'll use a task that will divide two numbers, as described in the command line.

This task is very similar to the one presented in step 5 of How it works for the Preparing a task recipe, earlier this chapter. However, instead of multiplying two numbers, we'll divide them.

How to do it...

  1. Create the task_with_error_handling_step1.py file, as follows:
    import argparse
    import sys
    def main(number, other_number...

Sending email notifications

Email has become an inescapable tool for everyday use. It's arguably the best place to send a notification if an automated task has detected something. On the other hand, email inboxes are already too full up with spam messages, so be careful.

Spam filters are also a reality. Be careful with whom to send emails to and the number of emails to be sent. An email server or address can be labeled as a spam source, and all emails may be quietly dropped by the internet.

This recipe will show you how to send a single email using an existing email account.

This approach is viable for spare emails sent to a couple of people, as a result of an automated task, but no more than that. Refer to Chapter 9, Dealing with Communication Channels, for more ideas on how to send emails, including groups.

Getting ready

For this recipe, we require a valid email account set up, which includes the following:

  • A valid email server using SMTP...
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Key benefits

  • Automate integral business processes such as report generation, email marketing, and lead generation
  • Explore automated code testing and Python’s growth in data science and AI automation in three new chapters
  • Understand techniques to extract information and generate appealing graphs, and reports with Matplotlib

Description

In this updated and extended version of Python Automation Cookbook, each chapter now comprises the newest recipes and is revised to align with Python 3.8 and higher. The book includes three new chapters that focus on using Python for test automation, machine learning projects, and for working with messy data. This edition will enable you to develop a sharp understanding of the fundamentals required to automate business processes through real-world tasks, such as developing your first web scraping application, analyzing information to generate spreadsheet reports with graphs, and communicating with automatically generated emails. Once you grasp the basics, you will acquire the practical knowledge to create stunning graphs and charts using Matplotlib, generate rich graphics with relevant information, automate marketing campaigns, build machine learning projects, and execute debugging techniques. By the end of this book, you will be proficient in identifying monotonous tasks and resolving process inefficiencies to produce superior and reliable systems.

Who is this book for?

Python Automation Cookbook - Second Edition is for developers, data enthusiasts or anyone who wants to automate monotonous manual tasks related to business processes such as finance, sales, and HR, among others. Working knowledge of Python is all you need to get started with this book.

What you will learn

  • Learn data wrangling with Python and Pandas for your data science and AI projects
  • Automate tasks such as text classification, email filtering, and web scraping with Python
  • Use Matplotlib to generate a variety of stunning graphs, charts, and maps
  • Automate a range of report generation tasks, from sending SMS and email campaigns to creating templates, adding images in Word, and even encrypting PDFs
  • Master web scraping and web crawling of popular file formats and directories with tools like Beautiful Soup
  • Build cool projects such as a Telegram bot for your marketing campaign, a reader from a news RSS feed, and a machine learning model to classify emails to the correct department based on their content
  • Create fire-and-forget automation tasks by writing cron jobs, log files, and regexes with Python scripting
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Table of Contents

15 Chapters
Let's Begin Our Automation Journey Chevron down icon Chevron up icon
Automating Tasks Made Easy Chevron down icon Chevron up icon
Building Your First Web Scraping Application Chevron down icon Chevron up icon
Searching and Reading Local Files Chevron down icon Chevron up icon
Generating Fantastic Reports Chevron down icon Chevron up icon
Fun with Spreadsheets Chevron down icon Chevron up icon
Cleaning and Processing Data Chevron down icon Chevron up icon
Developing Stunning Graphs Chevron down icon Chevron up icon
Dealing with Communication Channels Chevron down icon Chevron up icon
Why Not Automate Your Marketing Campaign? Chevron down icon Chevron up icon
Machine Learning for Automation Chevron down icon Chevron up icon
Automatic Testing Routines Chevron down icon Chevron up icon
Debugging Techniques Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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