Problem Formulation You have been given a number. How will you check if the number lies between two numbers? When you check if a number lies between two other numbers it returns a boolean that determines if the number is greater than or equal to the minimum number and also less than or equal to … Read more
Summary: Use negative step in the range() function to reverse the given sequnce as: range(start, stop, -step). Another workaround is to apply the reversed() function to the given range to reverse it as: reversed(range(start, stop)). Problem: Given a range/sequence of numbers, how will you reverse the range? Example: Given:# Given rangefor i in range(1, 6): … Read more
Problem Formulation and Solution Overview This article will show you how to generate password hashes in Python. To make it more interesting, we have the following running scenario: When new users join the Finxter Academy, they are asked for a password. How can we keep this data secure? To secure these passwords, we must convert … Read more
Summary: You can use one of these methods to delete multiple keys from a dictionary Python –(1) Iterate across the list of keys to be deleted and use the syntax del dict[‘key’](2) Iterate across the list of keys to be deleted and call the dictionary.pop(key)method.(3) Eliminate unrequired keys and reconstruct the original dictionary using a dictionary … Read more
Use Python’s built-in max() function with the key argument to find the longest string in a set. Call max(my_set, key=len) to return the longest string in the set using the built-in len() function to determine the weight of each string—the longest string has maximum length. 👉 Recommended Tutorial: How to Find the Longest String in … Read more
Coding Challenge 💬 Challenge: How to Find the Longest Line or String From a File in Python? Given the following text file: Depending on what exactly you’re looking for, you want to find the longest string word (A) or the longest line (B) in the file. Let’s dive into both variants next. Method 1: Find … Read more
The most Pythonic way to convert a list of floats fs to a list of strings is to use the one-liner fs = [str(x) for x in fs]. It iterates over all elements in the list fs using list comprehension and converts each list element x to a string value using the str(x) constructor. This … Read more
Problem Formulation Given the following DataFrame df: 💬 Challenge: How to apply a function f to each cell in the DataFrame? For example, you may want to apply a function that replaces all odd values with the value ‘odd’. Solution: DataFrame applymap() The Pandas DataFrame df.applymap() method returns a new DataFrame where the function f … Read more
💬 Question: How to convert a dictionary to a CSV in Python? In Python, convert a dictionary to a CSV file using the DictWriter() method from the csv module. The csv.DictWriter() method allows you to insert a dictionary-formatted row (keys=column names; values=row elements) into the CSV file using its DictWriter.writerow() method. 🌍 Learn More: If … Read more
Problem: How to convert a list of dictionaries to a csv file? Example: Given is a list of dicts—for example salary data of employees in a given company: Your goal is to write the content of the list of dicts into a comma-separated-values (CSV) file format. Your out file should look like this: my_file.csv: Name,Job,Salary … Read more
Problem Formulation You appear at an interview, and the interviewer intends to test your skills in writing concise one-line solutions. So he decides to present you with a long and complex-looking piece of code that is seemingly intimidating and asks you to come up with one-line solutions for the given code. Given: Challenges: Guess the … Read more
Wrong Way to Create and Initialize a List of Lists in Python A standard way to initialize a flat list in Python is the multiplication operator to create a new list by repeatedly concatenating an existing list: 🌍 Related Tutorial: How to create a list in Python? Consequently, many beginner coders try to use the … Read more