Problem Formulation Given string s, and character c. How to remove all characters in s after the first occurrence of c? Example Given: – string s = ‘hello world’, and – empty space character c = ‘ ‘. Desired result: ‘hello’ Method 1: string.index() + slicing To remove everything after the first occurrence of character … Read more
Hey Finxters! It is time for another Python subject that will come up for sure within your Python developer career. Problem Formulation: How to iterate over a generator twice? Then we will look at three solutions on how we can iterate twice, or even multiple times, over a generator or iterator. First, we must understand … Read more
This article will cover some advanced mathematical functions provided by the Sympy library. If you still have not read the first introductory article to Sympy, you can check it out here. Since most of the basic functions, like the ones for initiating a Sympy session on your terminal or for defining a function/variable, will not … Read more
Problem: Given a string; how to split/cut the string and extract the required characters? In this article, we will be discussing some interesting scenarios which allow us to split or cut a string and extract the necessary portion of the string that we need. Let us dive into each example/scenario and have a look at … Read more
Problem Formulation: Given a path to a folder as a Python string. The folder is non-empty. How to remove the whole folder in your Python script? Example: Say, you have the path=’path/to/folder’ in your Python script and it contains some files and subfolders: path –to —-folder ——file1.dat ——file2.dat ——subfolder1 ——–file3.dat ——subfolder2 ——–file4.dat You want to … Read more
First, let’s have a look at an image—hopefully telling us more than a thousand words: Okay, let’s go back to square one—before you understand hypergraphs, we first need to understand graphs. What Are Graphs? You most likely know graphs. The web graph consists of websites connected via hyperlinks. The websites are graph vertices and the … Read more
Python’s built-in filter() function is used to filter out elements that pass a filtering condition. It takes two arguments: function and iterable. The function assigns a Boolean value to each element in the iterable to check whether the element will pass the filter or not. It returns an iterator with the elements that pass the … Read more
Summary: To iterate over the dictionary items in random order get the list of items in a tuple with .items() or get the list of keys with .keys() or extract the values in a list using .values() , then shuffle and iterate through this list using the shuffle() method of the random module. Problem: Given a … Read more
Problem Formulation: How to fix the TypeError: len() of unsized object? TypeError: len() of unsized object There are many possible ways why this array may occur. One common pitfall is to use the len() function on a NumPy array with only one value. Example: Let’s consider the minimal example that creates this error message! Reason … Read more
Problem Formulation: Given a PyCharm project. How to install a library in your project within a virtual environment or globally? Solution that (almost) always works: Here’s the installation process as a short animated video: How to Install a Library on PyCharm? In some PyCharm versions, the installation steps will be slightly different. If this is … Read more
Problem Formulation: Given a PyCharm project. How to install the pandas library in your project within a virtual environment or globally? Solution that always works: Open File > Settings > Project from the PyCharm menu. Select your current project. Click the Python Interpreter tab within your project tab. Click the small + symbol to add … Read more
Machine Learning (ML) is a sought-after skill in today’s automated world. Google is one of the key players in the Machine Learning space. With the growing scale and popularity of deep learning, the limitations of a single machine become more and more pronounced. Motivation Training a model on a single computer can take a long … Read more