from abc import ABC
from datetime import datetime
import hashlib


class SingletonFunction(ABC):
    """
    提供公共函数和功能函数
    """

    def __init__(self):
        pass

    @staticmethod
    def call_datetime(need_str: bool = True):
        return str(datetime.now()) if need_str else datetime.now()

    @staticmethod
    def md5sum(string: str):
        md5 = hashlib.md5()
        password = string.encode("utf-8")
        md5.update(password)
        return md5.hexdigest()


singleton_function = SingletonFunction()