在字典中标识字典中最小日期

import datetime

def find_min_date(dictionary):
    min_date = None
    for key, value in dictionary.items():
        try:
            date = datetime.datetime.strptime(value, "%Y-%m-%d")
            if min_date is None or date < min_date:
                min_date = date
        except ValueError:
            continue

    if min_date is not None:
        min_date_str = min_date.strftime("%Y-%m-%d")
        dictionary["最小日期"] = min_date_str

    return dictionary

# 示例字典
dictionary = {
    "日期1": "2022-01-01",
    "日期2": "2022-01-03",
    "日期3": "2022-01-02",
    "其他键": "其他值"
}

# 找到最小日期并标识
result = find_min_date(dictionary)

print(result)

{
    "日期1": "2022-01-01",
    "日期2": "2022-01-03",
    "日期3": "2022-01-02",
    "其他键": "其他值",
    "最小日期": "2022-01-01"
}