Title case converter
Return the string with each word capitalised.
Longest word in a sentence
Write a function that returns the longest word from a sentence, with first-occurrence tie-breaking.
Replace vowels with stars
Write a function that replaces every vowel in a given string with an asterisk.
Normalize quotes
Replace all typographic quote characters with straight ASCII quotes.
Interleave Two Strings
Given two strings s1 and s2, return a new string that interleaves them character by character, starting with s1.
Center a string in a width
Write a function that centers a string within a specified width by adding spaces on both sides.
Remove Duplicates from String
Given a string, return a new string with each character that repeats consecutively reduced to a single occurrence.
Longest Word Finder
Write a function that extracts alphabetic words from a string and returns the longest one, with ties broken by earliest position.
Abbreviate Name
Create a function that takes a full name and returns an abbreviated version with initials and the last name.
Replace Spaces with Dashes
Write a function that replaces every space in a string with a dash.
Compress Consecutive Chars
Write a function that compresses a string by replacing runs of identical characters with the character followed by the count.
Index of First Occurrence
Implement a function that finds the starting index of a substring within a string, returning -1 when absent.
Parse Log Line
Write a function that parses a log line and returns a dictionary with timestamp, level, and message.
Replace multiple spaces
Implement a function that replaces every sequence of spaces with a single space.
Extract domain from URL
Extract the domain (hostname without port or www) from a given URL string.
Basic Calculator III
Implement a recursive descent parser to evaluate a fully parenthesized arithmetic expression with +, -, *, / and parentheses.
Minimum Remove Valid Parentheses
Given a string with parentheses and letters, remove the fewest parentheses to make it valid.
Parse URL components
Write parse_url that splits a URL into its standard components with defaults for missing parts.
Parse key-value lines
Parse structured key-value lines into a dictionary with support for quoted values and escaped characters.
Decode base64 string
Write a function that decodes a base64 string to its original UTF-8 text without using the base64 module.
User Friendly Message
Given a raw user input, format it into a single clean sentence with proper sentence case and trimming.
Showing 21 challenges · Strings & Text
Strings & Text — Python coding challenges
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This page lists strings & text challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.
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Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.