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>>> import decimal
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>>> 0.1 + 0.2
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>>> decimal.Decimal('0.1250')
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0.30000000000000004
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Decimal('0.1250')
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>>> decimal.Decimal('0.1') + decimal.Decimal('0.2')
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>>> ctx = decimal.Context(prec=2, rounding=decimal.ROUND_HALF_UP)
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Decimal('0.3')
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>>> ctx.create_decimal('0.1250')
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Decimal('0.13')