The family of Unix operating systems emerged in the late 1970s when Bell Systems made the source code of its technology open to the public. In the subsequent decades, universities, individuals, and corporations developed a multitude of extensions and new versions. Today, Unix is a trademarked standard that ensures that certain quality standards are met … Read more
When I first saw this, I was sure it’s a bug. Well—it’s a feature! In today’s short article, you’ll learn about a small Python trick that I call “string concatenation without +”. Let’s start with some code! Plus vs. Adjacent String Literal Concatenation There are two ways to concatenate string literals in Python: Using the … Read more
In Python, a dictionary is an implementation of a data structure known most commonly as an associative array. This collection of key-values pairs maps the key to the associated value that can be implemented in many ways from knowing the price of apples and peas to put into the grocery store app that is used … Read more
Every single code project that you will touch in your career will contain control flow statements such as while and if. A control flow statement requires Boolean logic to determine the program’s execution. Basics of Boolean Logic The basics of Boolean logic are simple. 1) The expression x and y is True, if both x … Read more
The Python chr() function takes one number as argument that is the specified Unicode and returns the character associated to this Unicode argument. For example, the call chr(101) returns the Unicode character ‘e’. The allowed range of arguments are all integers between 0 and 1,114,111 (included)—integers outside this interval will raise a ValueError. Here are … Read more
Python has powerful built-in capabilities for string manipulation. That’s why web companies like Google love Python—it’s a perfect fit for the text-based web. This guide shows you how to use string concatenation operators using multiple forms of education: Text Puzzle Video Exercise Ready to learn string concatenation? Let’s get started! A Textual Introduction to String … Read more
Slicing is one of the most popular Python features. Thus, understanding slicing is key to understand existing code bases. In this tutorial, I’m going to train your slicing skills. Ready? So, let’s go! ? Watch the Video Python Slicing Read About Slicing Slicing is a Python-specific concept for accessing a range of values in sequence … Read more
If you work in a data driven career, odds are you will at some point have to perform sorting on your data. Rather than writing your own sorting algorithm (which will most likely be far less efficient), Python provides a built-in function called sorted(). This function allows you to do basic sorting, such as arranging … Read more
Regular expressions are a strange animal. Many students find them difficult to understand – do you? I realized that a major reason for this is simply that they don’t understand the special regex characters. To put it differently: understand the special characters and everything else in the regex space will come much easier to you. … Read more
Python’s built-in callable(object) returns True if you could call the object argument like a function with the trailing parentheses in object(). You can make any object callable by implementing the instance’s __call__() method. For example, callable(callable) returns True because callable is a function object. But callable(3) returns False because an integer is not a function … Read more
Python is ranked as the second most popular programming language in the Tiobe index according to Zdnet.com. Python has gained popularity among the growing tech areas of machine learning and data science—and it has a simple, elegant syntax that is easy to learn. If you want to start learning Python—or you sit on another computer … Read more
Python’s built-in bytes(source) function creates an immutable bytes object initialized as defined in the function argument source. A bytes object is like a string but it uses only byte characters consisting of a sequence of 8-bit integers in the range 0<=x<256. The returned byte object is immutable—you cannot change it after creation. If you plan … Read more