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This guide will introduce you to the Python decimal library and class – Python tools which allow you to accurately work with decimal numbers without the rounding and accuracy issues which frequently arise when working with floating point numbers. Computers Can’t Perform Accurate Arithmetic With Decimal Numbers Decimal numbers are commonly stored as floating point number values. Computers are not particularly good at performing arithmetic with this type of numbers accurately. We break down why this is in our Ultimate Beginners Guide to Floating Point Math/Arithmetic Precision Problems. … Read more

This article will give a short overview of the Python os (Operating System) module – and show some examples of how it is used. What is the Python ‘os’ Library/Module? The Python os library contains helpful tools and functions for interacting with the underlying Operating System being used to execute the running Python code. It can be used to query information about the system environment – including operating system, disk space, memory information, and which path Python is being executed from. The information available will differ depending on which operating system Python is … Read more

This short article will show you how to use the Python help() function to view the documentation (Docstring) for a Python module, class, or function. Documenting Your Python Code with Docstrings You can document your Python code with a special string called a docstring. We’ve got a whole article on that here. The short version of it is this: put a triple quoted string immediately after declaring a function, class, or module in Python: “”” Just like this “”” …and you can later read from it using the help() … Read more

Should you use the != operator or the ‘is not’ statement when comparing values in Python? Read on to find out! The != Comparison Operator The != operator can be used to compare two variables or statements’ return values. If they are not equal, the statement will return TRUE. Python is forgiving when it comes to comparing variables of different types. So if the type of the variables being compared is different, but the value is the same, it will return TRUE (rather than throwing an error) as they are not equal in both type and value. myNumber … Read more

The Python slice() function can be used to get a portion of a list, tuple, string, or other sequence. This article will show you how to use it. Python slice() Function Syntax Here’s the syntax for the Python slice() function: slice(START, STOP, STEP) Note that: slice() does not return the specified portion of an object It returns a slice object which is used to retrieve the specified portion from a sequence – it does not contain the sequence itself. This is probably best demonstrated in the below examples START is the starting position (index) of the sequence you … Read more

Here’s everything you need to know about the Dictionary data type in Python, what it can store, and how to use it. Python has several built-in data types for storing data (more than other languages like JavaScript) – from basic types like integers, floating-point numbers, and strings to more complex types like lists, tuples, and dictionaries. What is a Type? A variable’s type defines what kind of value it can store and what can be done with it. What is a Dictionary? A dictionary is a variable type … Read more

We’ve covered how to use the slice function to slice strings, tuples, lists, and other sequences. This tutorial will show you how to slice dictionaries, with examples. Dictionaries Not sure what a dictionary is in the Python programming language? Get up to speed with our article here. The slice() Function and the islice() Function Check out the full article here on how the slice() function works – we’ve covered it in-depth. Unfortunately, the slice() function built-in to Python does not work with dictionaries. If you do try to use slice() with a dictionary type variable, you will receive the following error: TypeError: … Read more