13 lines
269 B
Python
13 lines
269 B
Python
from __future__ import annotations
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def price_trend(prices: list[float]) -> str:
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if not prices:
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return "stable"
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first, last = prices[0], prices[-1]
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if last > first:
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return "up"
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if last < first:
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return "down"
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return "stable"
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