logging.py 文件源码

def reopen(self):
        if self.inner_file is not None:
            self.inner_file.close()
        open(self.filename, 'a').close()
        f = open(self.filename, 'rb')
        f.seek(0, os.SEEK_END)
        length = f.tell()
        if length > 100*1000*1000:
            f.seek(-1000*1000, os.SEEK_END)
            while True:
                if f.read(1) in ('', '\n'):
                    break
            data = f.read()
            f.close()
            f = open(self.filename, 'wb')
            f.write(data)
        f.close()
        self.inner_file = codecs.open(self.filename, 'a', 'utf-8')