python文件派生

import time

class Foo:
    x = 1

    def __init__(self, y):
        self.y = y

    def __getattr__(self, item):  # 没有的情况下调用此方法
        print(item)

    def __setattr__(self, key, value):
        self.__dict__[key] = value

    def __delattr__(self, item):
        pass

# f1 = Foo(1)
# print(f1.y)
#
# print(dir(Foo.__dict__))

# 文件包装 写入的时候加入时间
class FileHandle:
    def __init__(self, filename, mode='r', encoding='utf8'):
        self.file = open(filename, mode, encoding=encoding)

    def write(self, line):
        t = time.strftime('%Y-%m-%d %X')
        self.file.write('{} {}'.format(t,line))

    def __getattr__(self, item):
        return getattr(self.file, item)

f = FileHandle('a.txt', 'w+', 'utf8')
f.write(1)
f.read()