Web Reference: string.upper().count(word.upper()) Since strings are immutable, it won't permanently change the text or the word. Apr 23, 2023 · Method 1: Using defaultdict () + lower () In this, we perform lower () to all the strings, before mapping in defaultdict. This ensures case insensitivity while mapping and cumulating frequency. Method 2: Using count () method. Time Complexity: O (n) Auxiliary Space: O (n) Method 3: Using Counter () function. Jul 28, 2025 · This article delves deep into the world of case-insensitive string counting in Python, exploring various techniques, their efficiency, and best practices. We'll journey from basic methods to advanced techniques, providing you with a comprehensive toolkit to tackle this common programming challenge.
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