Python 中文时间实体识别：从文本中提取日期和时间

import re
from datetime import datetime, timedelta
from dateutil.parser import parse
import jieba.posseg as psg

UTIL_CN_NUM = {
    '零': 0, '一': 1, '二': 2, '两': 2, '三': 3, '四': 4,
    '五': 5, '六': 6, '七': 7, '八': 8, '九': 9,
    '0': 0, '1': 1, '2': 2, '3': 3, '4': 4,
    '5': 5, '6': 6, '7': 7, '8': 8, '9': 9
}
UTIL_CN_UNIT = {'十': 10, '百': 100, '千': 1000, '万': 10000}

def cn2dig(src):
    if src == '':
        return None
    m = re.match('\d+', src)
    if m:
        return int(m.group(0))
    rsl = 0
    unit = 1
    for item in src[::-1]:
        if item in UTIL_CN_UNIT.keys():
            unit = UTIL_CN_UNIT[item]
        elif item in UTIL_CN_NUM.keys():
            num = UTIL_CN_NUM[item]
            rsl += num * unit
        else:
            return None
    if rsl < unit:
        rsl += unit
    return rsl

def year2dig(year):
    res = ''
    for item in year:
        if item in UTIL_CN_NUM.keys():
            res = res + str(UTIL_CN_NUM[item])
        else:
            res = res + item
    m = re.match('\d+', res)
    if m:
        if len(m.group(0)) == 2:
            return int(datetime.datetime.today().year / 100) * 100 + int(m.group(0))
        else:
            return int(m.group(0))
    else:
        return None

def parse_datetime(msg):
    if msg is None or len(msg) == 0:
        return None
    try:
        dt = parse(msg)
        return dt.strftime('%Y-%m-%d %H:%M:%S')
    except Exception as e:
        m = re.match(
            r'([0-9零一二两三四五六七八九十]+年)?([0-9一二两三四五六七八九十]+月)?'
            r'([0-9一二两三四五六七八九十]+[号日])?([上中下午晚早]+)?'
            r'([0-9零一二两三四五六七八九十百]+[点:.\.时])?'
            r'([0-9零一二三四五六七八九十百]+分?)?'
            r'([0-9零一二三四五六七八九十百]+秒)?', msg)
        if m.group(0) is not None:
            res = {
                'year': m.group(1),
                'month': m.group(2),
                'day': m.group(3),
                'hour': m.group(5) if m.group(5) is not None else '00',
                'minute': m.group(6) if m.group(6) is not None else '00',
                'second': m.group(7) if m.group(7) is not None else '00',
            }
            params = {}
            for name in res:
                if res[name] is not None and len(res[name]) != 0:
                    tmp = None
                    if name == 'year':
                        tmp = year2dig(res[name][:-1])
                    else:
                        tmp = cn2dig(res[name][:-1])
                    if tmp is not None:
                        params[name] = int(tmp)
            target_date = datetime.today().replace(**params)
            is_pm = m.group(4)
            if is_pm is not None:
                if is_pm == u'下午' or is_pm == u'晚上' or is_pm == '中午':
                    hour = target_date.time().hour
                    if hour < 12:
                        target_date = target_date.replace(hour=hour + 12)
            return target_date.strftime('%Y-%m-%d %H:%M:%S')
        else:
            return None

def check_time_valid(word):
    m = re.match('\d+$', word)
    if m:
        if len(word) <= 6:
            return None
    word1 = re.sub('[号|日]\d+$', '日', word)
    if word1 != word:
        return check_time_valid(word1)
    else:
        return word1

# 时间提取
def time_extract(text):
    time_res = []
    word = ''
    keyDate = {'今天': 0, '明天': 1, '后天': 2}
    for k, v in psg.cut(text):
        if k in keyDate:
            if word != '':
                time_res.append(word)
            word = (datetime.today() + timedelta(days=keyDate.get(k, 0))).strftime('%Y{y}%m{m}%d{d}').format(y='年',
                                                                                                             m='月',
                                                                                                             d='日')
        elif word != '':
            if v in ['m', 't']:
                word = word + k
            else:
                time_res.append(word)
                word = ''
        elif v in ['m', 't']:
            word = k
    if word != '':
        time_res.append(word)
    result = list(filter(lambda x: x is not None, [check_time_valid(w) for w in time_res]))
    final_res = [parse_datetime(w) for w in result]
    return [x for x in final_res if x is not None]


with open('copus.txt', 'r', encoding='utf-8') as f:
    text = f.read()

print(text, time_extract(text), sep=':')