Reverse a string
Return the characters of the string in reverse order.
Palindrome check
Return True if the string reads the same forwards and backwards (ignoring case and non-alphanumeric).
Title case converter
Return the string with each word capitalised.
Anagram check
Return True if two strings are anagrams of each other.
Repeat each character n times
Given a string s and an integer n, return a new string where each character of s is repeated n times consecutively.
Longest word in a sentence
Write a function that returns the longest word from a sentence, with first-occurrence tie-breaking.
Extract Digits Only
Given a string that may contain letters, symbols, and whitespace, extract all digits in order and return them as an integer.
Find all indexes of a substring
Write a function that returns a list of all starting indexes where a substring appears in a string, including overlapping occurrences.
Interleave Two Strings
Given two strings s1 and s2, return a new string that interleaves them character by character, starting with s1.
Sort characters alphabetically
Sort all characters in a string alphabetically and return the sorted string.
Initials from a Full Name
Return the uppercase initials of each word in a given full name.
Is pangram?
Implement is_pangram(s) to return True if the string contains every letter from 'a' to 'z' at least once, ignoring case and non-alphabetic characters.
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.
Mask email address
Given an email address, return a masked version that hides everything but the first and last character of the local part and the domain.
Find substring index
Implement a function that returns the starting index of the first occurrence of a substring using only basic string indexing and slicing.
Sort characters in string
Write a function that sorts the characters in a string and returns the sorted string.
Most Common Character
Return the character that appears most frequently in a string, breaking ties by earliest occurrence.
Index of First Occurrence
Implement a function that finds the starting index of a substring within a string, returning -1 when absent.
Safe Command Executor
Implement emulate_run that simulates running a command list and returns output and exit code.
Parse Log Line
Write a function that parses a log line and returns a dictionary with timestamp, level, and message.
Split on camelCase
Given a camelCase string, split it into words at uppercase letters and return them as lowercase words.
Validate username format
Implement a function that validates a username according to length, allowed characters, and no consecutive underscores.
Showing 24 challenges · easy · 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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