Reference library

Dictionaries & sets

Key–value maps, uniqueness, counting, grouping, and fast lookups.

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Dictionaries & sets easy

How to Count Words and Find Common Words in Python with Dictionaries and Sets

Build a simple text processor that counts unique words with dictionaries and finds common words across text halves using sets.

dictionaries sets word-count
Python 
def process_text(text):
    """Process text: count unique words with counts, find common words."""
    words = text.lower().replace(",", "").replace(".", "").split()
    
    word_counts = {}
    for word in words:
        word_counts[word] = word_counts.get(word, 0) + 1
    
    total_words = len(words)
    unique_wo…
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