Chris Python’s globals() function returns a dictionary of name –> object mappings. The names are the ones defined globally, i.e., defined by Python or in the outside scope of your program. The objects are the values associated to these names. For example, if you set variable x = [1, 2, 3], the globals() dictionary will contain … Read more
Challenge: Run a piece of Python code forever—until it is forcefully interrupted by the user. Solution: use a while loop with a Boolean expression that always evaluates to True. Examples: have a look at the following variants of an infinite while loop. You can also use a while condition that always evaluates to True. For … Read more
Python’s built-in hasattr(object, string) function takes an object and a string as an input. It returns True if one of the object‘s attributes has the name given by the string. Otherwise, it returns False. Usage Learn by example! Here’s an example on how to use the hasattr() built-in function. The output of this code snippet … Read more
Programming is about using lower-level functionality to create higher-level functionality. In general, any programming language is a collection of functions that in turn build upon functions provided by the operating system. You must master the art of building your own code with the help of existing functionality, instead of reinventing the wheel! Keyword Arguments Functions … Read more
Problem: You have a Python code file script.py and you want to run it in your Python shell with arguments. Example: You seek a function execute(“script.py”, arg1, arg2, …). The arguments arg1, arg2, … should be used within script.py. How to execute the Python file within your Python code by passing the arguments to the … Read more
This tutorial will show you everything you need to get started training your first models using decision tree learning in Python. To help you grasp this topic thoroughly, I attacked it from different perspectives: textual, visual, and audio-visual. So, let’s get started! Why Decision Trees? Deep learning has become the megatrend within artificial intelligence and … Read more
For a coder, understanding the Quicksort algorithm is like knowing the secret of 42—either you get it, or you don’t belong to the club. If you don’t know either, let’s work on the first one! The Quicksort Algorithm — A Python Implementation The algorithm is a variant of the popular Quicksort algorithm. The function qsort … Read more
If you’re like me, you want to come to the heart of an issue fast. Here’s the 1-paragraph summary of the enumerate() function—that’s all you need to know to get started using it: Python’s built-in enumerate(iterable) function allows you to loop over all elements in an iterable and their associated counters. Formally, it takes an … Read more
Python’s built-in divmod(a, b) function takes two integer or float numbers a and b as input arguments and returns a tuple (a // b, a % b). The first tuple value is the result of the integer division a//b. The second tuple is the result of the remainder, also called modulo operation a % b. … Read more
Challenge: How to create a multi-line string in Python? In this tutorial, I’ll show you four methods to create and maintain multi-line strings in Python. The most Pythonic ones are the first two methods with triple single quotes ”’ … ”’ or triple double quotes “”” … “”” that wrap a string across multiple lines. … Read more
This is a chapter draft of our book Python Dash with NoStarch: Why an IDE Using an integrated development environment (IDE) has the potential to significantly accelerate your programming productivity. Many programmers do not unlock their full potential until they finally decide to switch from a simple code editor to an IDE—and mastering the advanced … Read more
Python is one of the most popular programming language according to a recent IEEE Spectrum article. Python developers are among the highest-paid across all programming languages: on average you can expect to bring home 105,000$ per year. Major companies such as Google, Facebook, and Dropbox use Python for web crawling, data science, and user Interfaces. … Read more