42 lines
1013 B
Python
42 lines
1013 B
Python
"""中国大陆身份证号解析（周岁年龄）。"""
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from __future__ import annotations
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import re
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from datetime import date
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from typing import Optional
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_ID18_RE = re.compile(r"^\d{17}[\dX]$")
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def calc_age_from_chinese_id_card(
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id_card: Optional[str],
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*,
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today: Optional[date] = None,
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) -> Optional[int]:
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"""从 18 位身份证号计算周岁。号码不完整或出生日期无效时返回 None。"""
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if not id_card or not isinstance(id_card, str):
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return None
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s = id_card.strip().upper()
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if not _ID18_RE.match(s):
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return None
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try:
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year = int(s[6:10])
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month = int(s[10:12])
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day = int(s[12:14])
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except ValueError:
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return None
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try:
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birth = date(year, month, day)
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except ValueError:
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return None
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ref = today or date.today()
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age = ref.year - birth.year
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if (ref.month, ref.day) < (birth.month, birth.day):
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age -= 1
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if age < 0 or age > 120:
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return None
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return age
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