Python Coding Challenges

strings casing manipulation

Camel Case Converter

Write a function that converts a space-separated phrase into lower camelCase.

strings case-conversion parsing

Kebab Case Converter

Implement a function that converts any string to kebab-case, handling spaces, underscores, camelCase, and punctuation.

+8 pts 15m

Count Syllables (Simple)

Count syllables in a word by counting groups of consecutive vowels (a, e, i, o, u).

strings vowels counting

strings case-insensitive set

Is isogram?

Write a function that checks whether a given word is an isogram, ignoring letter case and only considering alphabetic characters.

Rotate String Right

Implement a function that rotates a given string to the right by a specified number of positions, handling shifts larger than the string length.

strings rotation slicing

strings parsing run-length-encoding

Expand compressed string

Implement a function that expands run-length encoded strings (e.g., 'a3b2' → 'aaabb').

strings counting substrings

Count Substrings

Implement a function that counts non-overlapping occurrences of a substring in a given string.

strings counting dictionary

Most Common Character

Return the character that appears most frequently in a string, breaking ties by earliest occurrence.

Isomorphic Strings Check

Given two strings, check if they are isomorphic by verifying a one-to-one character mapping.

strings mapping hash-map

Index of First Occurrence

Implement a function that finds the starting index of a substring within a string, returning -1 when absent.

strings search index

formatting strings function

Error message formatter

Write a function that constructs a formatted error message from a code, an optional context, and a fallback message.

Stack Trace Sanitizer

Implement a function that rewrites traceback file paths to basenames only.

strings regex parsing

Extract Hashtags

Extract unique hashtags from a given text string in the order they appear.

strings parsing hashtags

Extract mentions

Extract unique @mentions from a string, respecting email-like patterns and punctuation.

strings parsing sets

Validate time format

Check whether a given string is a valid 24-hour time in HH:MM format.

strings validation time

strings whitespace normalization

Replace multiple spaces

Implement a function that replaces every sequence of spaces with a single space.

Extract Quoted Strings

Write a function that extracts the text inside every double-quoted substring from a given string.

strings parsing quotes

strings parsing camelcase

Split on camelCase

Given a camelCase string, split it into words at uppercase letters and return them as lowercase words.

Extract domain from URL

Extract the domain (hostname without port or www) from a given URL string.

url parsing strings

strings whitespace split-join

Normalize Whitespace

Write a function that normalizes any whitespace in a string to single spaces and trims the ends.

+5 pts 10m

Strip Leading Zeros

Write a function that strips leading zeros from a string representing a non-negative integer.

strings strip lstrip

+5 pts 5m

parsing strings dictionaries

Parse key=value pairs

Implement a parser that converts a space-separated 'key=value' string into a Python dictionary, supporting quoted values.

strings parsing file-paths

Extract file extensions

Implement a function that extracts the extension from a filename according to standard rules.

strings validation returns

Validate username format

Implement a function that validates a username according to length, allowed characters, and no consecutive underscores.