You may have read about the ‘V’s in Big Data: Volume, Velocity, Variety, Veracity, Value, Volatility. Variance is yet another important ‘V’ (it measures Volatility of a data set). In practice, variance is an important measure with important application domains in financial services, weather forecasting, and image processing. Variance measures how much the data spreads … Read more
Short answer: use the expression list(dict.keys()). Problem Formulation Given a dictionary that maps keys to values. Return the keys as a list. For example: Given dictionary {‘Alice’: 18, ‘Bob’, 21, ‘Carl’: 24} Return the keys as a list [‘Alice’, ‘Bob’, ‘Carl’] Solution The dict.keys() method returns a list of all keys in Python 2. The … Read more
Problem Formulation Given two NumPy arrays a and b. How to concatenate both? Method 1: np.concatenate() NumPy’s concatenate() method joins a sequence of arrays along an existing axis. The first couple of comma-separated array arguments are joined. If you use the axis argument, you can specify along which axis the arrays should be joined. For … Read more
A typical online search queries the meaning of data abstraction in Python. When I began learning Python, the answers I found caused more confusion than they solved. Today I will describe data abstraction in a clear way that will assist you in better understanding the concept. We will then apply that concept in code to … Read more
Knowing where you are is important, whether you are in the outdoors, stumbling to the toilet in the middle of the night, or simply programming. Dealing with your midnight confusing or outdoors route-finding skills are a little more complicated, but fortunately, it is pretty easy to figure out your current path in Python. ? Method … Read more
[toc] ?️ Company Tags: As reported by numerous programmers across the globe, this question has been asked in coding interviews/rounds by companies like- Amazon Accolite Adobe Cisco Cognizant Goldman Sachs VMWare So, if you are preparing for your upcoming coding interview, then you might well come across this question in your coding round. Can you … Read more
Python’s not operator returns True if the single operand evaluates to False, and returns False if it evaluates to True. Thus, it logically negates the implicit or explicit Boolean value of the operand. As you read through the article, you can also watch my video for supporting explanations: Python Not Operator on Boolean You can … Read more
#Approach 1: Iterative Approach to Reverse Linked List Test Cases: # Example 1 linked_list = Solution() linked_list.push(5) linked_list.push(4) linked_list.push(3) linked_list.push(2) linked_list.push(1) Output: Given linked list 1 2 3 4 5 Reversed linked list 5 4 3 2 1 # Example 2 linked_list = Solution() linked_list.push(5) linked_list.push(4) linked_list.push(3) linked_list.push(2) linked_list.push(1) Output: Given linked list 1 2 … Read more
From teaching hundreds of thousands of students Python, I found this error to be a classic. I think understanding classes is hard enough, but many coders who’ve just started to learn about Python are rightly confused ? about the TypeError that complains about too few positional arguments. Let’s resolve this confusion once and for all, … Read more
I love tweaking my coding workflow. Small improvements accumulate over time and can lead to a massive productivity increase. Today, I caught myself being annoyed that I always needed to spend three clicks or so just to open a Python file in IDLE, the default Python editor on Windows. Time to change that! Do you … Read more
Windows normally installs Python on one of the two locations: C:\Python39 C:\Users\YourUser\AppData\Local\Programs\Python\Python39 For me, it’s the latter. For you, it may be different—this article shows you how to check for yourself! 🙂 For your convenience, I’ve made a short gif that shows how I rushed through the code on my Windows machine: Before you start, … Read more
Today we’re going to look at the Python Method Resolution Order or MRO for short. If you’ve been following the tutorials on Python classes and inheritance, and you’ve been practicing in code, you’ll understand that once the hierarchy of classes moves into multiple inheritances, you may return strange results or end up with incomprehensible errors. … Read more