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This tutorial will examine several methods and best practices for reading a file line-by-line in the Python programming language. Reading a file line-by-line will be useful for parsing log files, CSV spreadsheet files, or even reading files you have generated from an application yourself. Line by Line File Reading – Examples The examples on this page will read from a text file named mytext.txt with the following content: Linux Is Very Cool Using the readlines() Function The following python code will call the built-in open() function, which … Read more

This tutorial will teach you how to find the length of a list (array) in Python using some code examples. There are four data structures built into Python: tuples, sets, dictionaries, and lists. They are important for programmers because they allow for iteration over their contents. When we talk about data structures such as lists in Python, we are referring to a collection data type. Lists in Python can be ordered and changed. Also, unlike the sets collection type, a list allows for duplicated entries, … Read more

Even outside of programming, people perform list reversal regularly, for example, to re-order eBay items from high to low then low to high. It is a handy operation, and Python provides several ways to accomplish it. Method 1: Using the built-in reverse() function This method has the advantage of being simple and easy to understand when using someone else’s code. For example, if we have stored our list in “staffNames”: staffNames = [“Abigail”, “Chris”, “Denise”, “Fred”] staffNames.reverse() When executed, this method doesn’t automatically give a … Read more

Every programming language has special characters that trigger certain behaviors in your code – and Python is no exception. These characters cannot be used in strings (as they are reserved for use in your code) – and must be “escaped” to tell the computer that the character should just be treated as a regular piece of text rather than something that needs to be considered while the code is being executed. If you want to be able to leave yourself notes in your code, check … Read more

In this tutorial, we explain the two methods used to make multiline comments in Python, with examples. There are some drawbacks to one of the methods, so pay attention. Code without comments is like a story written in a language you only half understand. You might be able to figure out the main points, but you’ll miss some nuances and it would be way easier with a translation alongside it. Most coders hate code with no comments or limited comments, so finding ways to clearly … Read more

In this article, we explain how to check whether a file or directory exists in Python and include some useful examples to help you get started. Python is a high-level programming language with dynamic semantics. Developed in the early 90s, and named after the Monty Python comedy troupe, it uses simple, easy-to-learn syntax and remains very popular amongst the programming community. It is particularly attractive for Rapid Application Development (RAD) and for its ability to connect existing components together. Python can be used for: server-side … Read more