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Pythonで西暦から和暦への変換
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| from datetime import date, datetime | |
| WAREKI = [ | |
| (date(1989,1,8), date(2019,4,30), "平成"), | |
| (date(2019,5,1), date.max, "令和"), | |
| ] | |
| def seireki2wareki(target: str) -> str: | |
| try: | |
| target = datetime.strptime(target, "%Y-%m-%d").date() | |
| except ValueError: | |
| raise ValueError(f"invalid date: {target}") | |
| for start, end, gengo in WAREKI: | |
| if not start <= target <= end: | |
| continue | |
| year = target.year - start.year + 1 | |
| if year == 1: | |
| year = "元" | |
| return f"{gengo}{year}年{target.month}月{target.day}日" | |
| raise ValueError(f"date is too old or new: {target}") | |
| print(seireki2wareki("1999-03-12")) | |
| print(seireki2wareki("2020-01-24")) | |
| print(seireki2wareki("1998-02-01")) |
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