包装特性之----授权

class FileHandle:
    def __init__(self,filename,mode = ‘r‘,encoding = ‘utf-8‘):
        self.file = open(filename,mode,encoding = encoding)
        self.mode = mode
        self.encoding = encoding

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

f1 = FileHandle(‘a.txt‘,‘w+‘)
print(f1.__dict__)
print(‘==>‘,f1.read)
f1.write("爱你一万年\n")
f1.seek(0)
print(f1.read())

import time
class FileHandle:
    def __init__(self,filename,mode = ‘r‘,encoding = ‘utf-8‘):
        self.file = open(filename,mode,encoding = encoding)
        self.mode = mode
        self.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)

f1 = FileHandle(‘a.txt‘,‘w+‘)
print(f1.__dict__)
print(‘==>‘,f1.read)
f1.write("我和我的猫很想你\n")
f1.write("哈哈哈，骗你的\n")
f1.write("我没有猫\n")
f1.write("也没有你")
f1.seek(0)
print(f1.read())