Count with a dict

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Loop once and add 1 per key — the standard counting pattern.

Which pattern counts occurrences?

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counts = {}
for w in ['a','a','b']:
    counts[w] = counts.get(w,0)+1
print(counts['a'])

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counts = {}
for w in ['a','a','b']:
    counts[w] = counts.get(w,0)+1
print(counts['a'])

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