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with open('very_big_text.txt') as f:
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# multiline solution
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# count = 0
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# text = f.read()
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# for character in text:
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# if character.isupper():
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# count += 1
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# one-liner
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count = sum(1 for line in f for character in line if character.isupper())
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print(count)
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