Problem Formulation 💬 Challenge: Given an integer n. How to create a list of n empty strings ” in Python? Here are three examples: Given n=0. Create list []. Given n=3. Create list [”, ”, ”]. Given n=5. Create list [”, ”, ”, ”, ”]. Method 1: List Multiplication You can create a list of … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to write integers to a file in Python. To make it more fun, we have the following running scenario: MediTech, a pharmaceutical manufacturing company, is seeking the best way to save its drug test results. They have contacted you to provide the possible solutions. … Read more
Problem Formulation Given a CSV file (e.g., stored in the file with name ‘my_file.csv’). INPUT: file ‘my_file.csv’ 9,8,7 6,5,4 3,2,1 Challenge: How to convert the CSV file to a list of tuples, i.e., putting the row values into the inner tuples? OUTPUT: Python list of tuples [(9, 8, 7), (6, 5, 4), (3, 2, 1)] … Read more
Problem Formulation Given a CSV file (e.g., stored in the file with name ‘my_file.csv’). INPUT: file ‘my_file.csv’ 9,8,7 6,5,4 3,2,1 Challenge: How to convert it to a list of lists (=nested list), i.e., putting the row values into the inner lists? OUTPUT: Python list of lists [[9, 8, 7], [6, 5, 4], [3, 2, 1]] … Read more
Convert a CSV file to a list of Python dictionaries in three steps: Create a CSV file object f using open(“my_file.csv”) and pass it in the csv.DictReader(f) method. The return value is an iterable of dictionaries, one per row in the CSV file. Each dictionary maps the column header from the first row to the … Read more
The best way to convert a CSV file to a Python dictionary is to create a CSV file object f using open(“my_file.csv”) and pass it in the csv.DictReader(f) method. The return value is an iterable of dictionaries, one per row in the CSV file, that maps the column header from the first row to the … Read more
In this article, you’ll learn about the following topics: List unpacking in Python Tuple unpacking in Python String unpacking in Python ValueError: too many values to unpack (expected k) ValueError: not enough values to unpack (expected x, got y) Unpacking nested list or tuple Unpacking underscore Unpacking asterisk Sequence Unpacking Basics Python allows you to … 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
Problem: How to convert one or more tuples to a csv file? Example: Given is a tuple or list of tuples—for example, salary data of employees in a given company: Your goal is to write the content of the list of tuples into a comma-separated-values (CSV) file format. Your out file should look like this: … Read more
Problem: How to convert a list of lists to a csv file? Example: Given is a list of list—for example salary data of employees in a given company: Your goal is to write the content of the list of lists into a comma-separated-values (CSV) file format. Your out file should look like this: # file.csv … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to convert HEX values to an ASCII string in Python. To make it more fun, we have the following running scenario: Carrier Coders has decided to display a Quote of the Day on their website. Each quote is transmitted daily as HEX values. You … Read more