Python has list comprehension and dictionary comprehension as a concise way to create a list or a dictionary by modifying an existing iterable. Python also has generator expressions that allow you to create an iterable by modifying and potentially filtering each element in another iterable and passing the result in a function, for instance. Does … Read more
Summary: The most pythonic approach to add two lists element-wise is to use zip() to pair the elements at the same positions in both lists and then add the two elements. Here’s a quick look at the solution: [x + y for x, y in zip(li_1, li_2)]. An alternate proposition to this without using zip: … Read more
Before we learn about the money, let’s get this question out of the way: What is a Quant Developer? A quantitative developer (i.e., Quant) is a financial programmer focused on financial modeling and quantitative finance and trading. Quants use their profound knowledge of statistics and math, finance, data structures, algorithms, machine learning, scientific computing, data … Read more
💬 Question: Given a list of lists such as [[1, 2], [3, 4]]. How to convert it to a tuple of tuples such as ((1, 2), (3, 4))? If you’re in a hurry, here’s the most Pythonic way to convert a nested list to a nested tuple: Use a generator expression with the built-in tuple() … Read more
💬 Question: Given a tuple of tuples such as ((1, 2), (3, 4)). How to convert it to a list of lists such as [[1, 2], [3, 4]]? If you’re in a hurry, here’s the most Pythonic way to convert a nested tuple to a nested list: The list comprehension statement [list(x) for x in … Read more
Summary: You can caculate the logistic sigmoid function in Python using: Problem: Given a logistic sigmoid function: If the value of x is given, how will you calculate F(x) in Python? Let’s say x=0.458. 💡 Note: Logistic sigmoid function is defined as (1/(1 + e^-x)) where x is the input variable and represents any real … Read more
Before we learn about the money, let’s get this question out of the way: What is a Test Automation Engineer? A Test Automation Engineer is a software developer who creates automated software tests for existing or new applications. Testing is a crucial phase in the software development cycle to learn about bugs, usability, and security … Read more
The post is part 6 and continues our Smart Contract Security Series: Ownership Exploit Private Variable Exploit Reentrancy Attack tx.origin Phishing Attack Denial of Service Attack Storage Collision Attack Randomness Attack Replay Attack The DelegateCall attack or storage collision is expounded in this post. Before you can grasp this exploit, you must first understand how … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to remove a comma/commas from a string in Python. To make it more fun, we have the following running scenario: We have a famous proverb, written by Desiderius Erasmus, that contains a comma or commas that need to be removed as it was not … Read more
English/US keyboards are QWERTY keyboards, again named after the first six letters on the keyboard. Here’s a screenshot of an English/US “QWERTY” keyboard layout: German/European keyboards are QWERTZ keyboards, named after the first six letters on the keyboard. Here’s a screenshot of a German “QWERTZ” keyboard layout: 💬 Question: How to switch between German and … Read more
Summary: The most straightforward way to overwrite the previous print to stdout is to set the carriage return (‘\r’) character within the print statement as print(string, end = “\r”). This returns the next stdout line to the beginning of the line without proceeding to the next line. Problem Formulation Problem Definition: How will you overwrite … Read more
In Python, the numpy.zeros() function returns a new array of given shape and type, filled with zeros. Here is the parameter table of numpy.zeros(). If it sounds great to you, please continue reading, and you will fully understand the numpy.zeros() function through Python code snippets and vivid visualization. Concretely, I will introduce its syntax and … Read more