Simple sentence
Input
title_case("hello world")
Output
Hello World
Each word's first letter is uppercased and the rest lowercased.
Full lesson preview
Convert a string to title case
Transform each space-separated word so its first character is uppercase and the rest are lowercase, preserving spacing.
Python practice15 minString PatternsIntermediateLast updated March 18, 2026
Problem statement
Write a function title_case(s) that returns a new string where each word (defined as a sequence of characters separated by space characters) has its first character converted to uppercase and the remaining characters converted to lowercase. All original spacing (including leading, trailing, and multiple intermediate spaces) must be preserved exactly.
Notes:
- Words are delimited only by the space character (' ').
- If a token between spaces is an empty string (because of consecutive spaces), it should remain empty so the spacing is preserved.
- If the input string is empty, return an empty string.
Task
Implement a function that converts a string to title case while preserving original spacing.
Examples
Input format
A single string s passed as an argument to title_case(s).
Output format
Return a single string with title-cased words and original spacing preserved.
Constraints
- 0 <= len(s) <= 2000
- Only split on the space character ' ' to determine words
- Do not collapse or normalize whitespace
Samples
Sample 1
Input
title_case(" leading and multiple spaces ")
Output
Leading And Multiple Spaces
Leading, trailing, and multiple spaces are preserved; each non-empty token is title-cased.