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With Python you can concatenate strings in different ways, the basic one is with the + operator. If you have two strings (string1 and string2) you can concatenate them using the expression string1 + string2. Python also provides the format() method to concatenate multiple strings together. The first and most basic way to concatenate two … Read more
One of the data types available in Python is the boolean. Knowing booleans helps create logical conditions in your Python applications. The boolean is one of the data types provided by the Python programming language. A boolean can have two values: True or False. Booleans allow to create logical conditions that define the behaviour of … Read more
How do you add an element at the end of a Python list? This is what the Python append method is for and append is not only for lists. The Python append() method adds an element at the end of an existing list. Also, it modifies the existing list instead of creating a new one. … Read more
In this tutorial we will calculate the absolute value of numeric types in Python. We will also look at different libraries that allow to calculate it. To calculate the absolute value of a number in Python you can use the abs() built-in function. The argument passed to the abs function can be an integer, a … Read more
In this guide, I will show you how to use the with statement to simplify the way you open and handle files in your Python programs. The with statement creates a context manager that simplifies the way files are opened and closed in Python programs. Without using the with statement a developer has to remember … Read more
Knowing how to execute a shell command in Python helps you create programs to automate tasks on your system. There are multiple ways to execute a shell command in Python. The simplest ones use the os.system and os.popen functions. The recommended module to run shell commands is the Python subprocess module due to its flexibility … Read more
Bash has several internal variables and in this article we will look at the variable $$. What does this variable mean? How can you use it? $$ is a Bash internal variable that contains the Process ID (PID) of the shell running your script. Sometimes the $$ variable gets confused with the variable $BASHPID that … Read more
If you are working with Linux at some point you will likely start writing Bash scripts. The more your code will grow the more you will realise how useful Bash functions can be. What is a Bash function? Functions are used in Bash scripts, as in other programming languages, to group code in a simpler … Read more
The Bash array data type gives you a lot of flexibility in the creation of your shell scripts. Bash provides two types of arrays: indexed arrays and associative arrays. Indexed arrays are standard arrays in which every element is identified by a numeric index. In associative arrays every element is a key-value pair (similarly to … Read more
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