Programming Challenge š¬ Challenge: Given a Python string. Find the longest substring for which holds that all of its characters are in alphabetical order so that the first character comes earlier in the alphabet than the second character, and so on. Here are three examples: string: ‘helloworld’, longest substring: ‘ellow’ string: ‘abcde’, longest substring: ‘abcde’ … Read more
Problem Formulation and Solution Overview At different times during your career as a Python Coder, you will encounter situations where you must determine the highest index of a substring occurrence. This article outlines various ways to accomplish this. š¬ Question: How would we write code to find the highest index of a substring? We can … Read more
The article begins by formulating a problem regarding how to extract emails from any website using Python, gives you an overview of solutions, and then goes into great detail about each solution for beginners. At the end of this article, you will know the results of comparing methods of extracting emails from a website. Continue … Read more
Problem Formulation š¬ Challenge: Given a Python list of strings and a query string. Find the strings that partially match the query string. Example 1: Input: [‘hello’, ‘world’, ‘python’] and ‘pyth’ Output: [‘python’] Example 2: Input: [‘aaa’, ‘aa’, ‘a’] and ‘a’ Output: [‘aaa’, ‘aa’, ‘a’] Example 3: Input: [‘aaa’, ‘aa’, ‘a’] and ‘b’ Output: [] … Read more
The easiest way to convert a tab-delimited values (TSV) file to a comma-separated values (CSV) file is to use the following three lines of code: import pandas as pd df = pd.read_csv(‘my_file.txt’, sep=’\t’, header=None) df.to_csv(‘my_file.csv’, header=None) We’ll explain this and other approaches in more detail next—scroll down to Method 3 for this exact method. Problem … Read more
Problem Formulation š¬ Challenge: How to design a regular expression pattern that matches whitespace characters such as the empty space ‘ ‘ and the tabular character ‘\t’, but not the newline character ‘\n’? An example of this would be to replace all whitespaces (except newlines) between a space-delimited file with commas to obtain a CSV. … Read more
The easiest way to convert a space-delimited file to a comma-separated values (CSV) file is to use the following three lines of code: import pandas as pd df = pd.read_csv(‘my_file.txt’, sep=’\s+’, header=None) df.to_csv(‘my_file.csv’, header=None) We’ll explain this and other approaches in more detail next—scroll down to Method 3 for this exact method. Problem Formulation Given … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to find all matches in a string using regex. The Regular Expression, also referred to as regex, is a complex pattern to search for and locate matching character(s) within a string. At first, this concept may seem daunting, but with practice, regex will improve … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to replace whitespaces with underscores in Python. To make it more fun, we have the following running scenario: Bryan, an IT Instructor, has given his students a Python coding challenge: Take a famous quote and replace all whitespaces with underscores in four (4) ways: … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to convert a String representation of a list consisting of multiple numbers to a list of integers in Python. š Related Tutorial: How to convert a list of integers to a list of strings in Python? To make it more fun, we have the … Read more
Iām sitting in front of my computer refactoring Python code and have just thought of the following question: Can You Use a Regular Expression with the Python string.startswith() Method? The short answer is no. The string.startswith() method doesn’t allow regular expression inputs. And you don’t need it because regular expressions can already check if a … Read more
You can count the number of words in string using one of the following options: Method 1: Using split() and len() Method 2: Using regex Method 3: Using a For Loop Method 4: Using count Method 5: Using sum Problem Formulation Given a string – sentence. How many words does the string sentence have within … Read more