Book Image

Mastering Python Scripting for System Administrators

By : Ganesh Sanjiv Naik
Book Image

Mastering Python Scripting for System Administrators

By: Ganesh Sanjiv Naik

Overview of this book

Python has evolved over time and extended its features in relation to every possible IT operation. Python is simple to learn, yet has powerful libraries that can be used to build powerful Python scripts for solving real-world problems and automating administrators' routine activities. The objective of this book is to walk through a series of projects that will teach readers Python scripting with each project. This book will initially cover Python installation and quickly revise basic to advanced programming fundamentals. The book will then focus on the development process as a whole, from setup to planning to building different tools. It will include IT administrators' routine activities (text processing, regular expressions, file archiving, and encryption), network administration (socket programming, email handling, the remote controlling of devices using telnet/ssh, and protocols such as SNMP/DHCP), building graphical user interface, working with websites (Apache log file processing, SOAP and REST APIs communication, and web scraping), and database administration (MySQL and similar database data administration, data analytics, and reporting). By the end of this book, you will be able to use the latest features of Python and be able to build powerful tools that will solve challenging, real-world tasks
Table of Contents (21 chapters)

Regular expressions

In this section, we are going to learn about regular expressions in Python. Regular expression is a specialized programming language, which is embedded in Python and is available to users through the re module. We can define the rules for the set of strings that we want to match. Using regular expressions, we can extract specific information from files, code, documents, spreadsheets, and so on.

In Python, a regular expression is denoted as re and can be imported through the re module. Regular expressions support four things:

  • Identifiers
  • Modifiers
  • Whitespace characters
  • Flags

The following table lists the identifiers, and there's a description for each one:




Matches alphanumeric characters, including underscore (_)


Matches non-alphanumeric characters, excluding underscore (_)


Matches a digit