Python’s built-in iter() function returns an iterator for the given object. For example, iter([1, 2, 3]) creates an iterator for the list [1, 2, 3]. You can then iterate over all elements in the iterator, one element at a time, in a for or while loop such as: for x in iter([1, 2, 3]). Basic … Read more
Problem Formulation: How to check if all characters of a string are uppercase? Background: A string is a sequence of characters, and is amongst the most commonly used and popular data types in Python. Strings can be enclosed by either single or double quotes and are ‘immutable’, meaning they can’t be changed once created. There … Read more
Python’s built-in slice() function returns a new slice object you can use to slice over sequences such as lists, strings, or tuples. Read more about lists in our full tutorial about Python Slicing. Example 1: Slice with Stop Argument One of the best way to learn is by example! Here are some examples of how … Read more
Problem Formulation: What does the double colon string[::2] or sequence[3::4] mean in Python? >>> string[::2] You can observe a similar double colon :: for sequences: >>> lst = [1, 2, 3, 4, 5, 6, 7, 8, 9] >>> lst[::2] Answer: The double colon is a special case in Python’s extended slicing feature. The extended slicing … Read more
If you don’t protect your castle, they’ll come after you. From teaching thousands of freelancer students, we know that many freelance developers fear that unhappy clients come after their personal assets. Everyone makes mistake and these mistakes can become quite costly when submitting freelance work to a client. You may wonder: Can you protect against … Read more
Are you looking for the best way of becoming a professional Python developer? After reading this article, you will have a crystal clear plan of how to start learning Python. You don’t need any programming skills for this plan to work. In short, you invest 70% of your learning time in practical projects and 30% … Read more
Whether you are a beginner or a professional, dictionaries are an integral part of your programming journey, especially if you are coding in Python. Python dictionaries are all about key-value pairs which help you to perform your task. There are restrictions on dictionary keys, but values have none. Literally, anything can be a value. As … Read more
Problem Formulation: Given a float number. How to convert it to octal representation? Examples: Consider the following desired conversions from float decimal numbers to their converted float octal numbers. input: 3.14 output: 3.1075 input: 0.01 output: 0.005 input: 12.325 output: 14.246 You can play with some examples here: Solution: The following code function float_to_octal() takes … Read more
Python’s built-in open() function opens a file and returns a file object. The only non-optional argument is a filename as a string of the file to be opened. You can use the file object to access the file content. For example, file_obj.readlines() reads all lines of such a file object. Here’s a minimal example of … Read more
This article will cover a specific issue that most Python users encounter when using Matplotlib for plotting their graphs. I am talking about defining multiple subplots and being able to access and change their properties individually. In the following sections, we will see how to use the Matplotlib function .subplots() for generating multiple subplots and … Read more
I’m sitting in front of my computer refactoring Python code and have just thought of the following question: Can You Use a Regular Expression with the Python string.startswith() Method? The short answer is no. The string.startswith() method doesn’t allow regular expression inputs. And you don’t need it because regular expressions can already check if a … Read more
Python’s built-in super() method returns a temporary object of the superclass to help you access its methods. Its purpose is to avoid using the base class name explicitly. It also enables your class to inherit from multiple base classes. Visual Idea super() The idea is simple: use super() to call the methods defined in the … Read more