PartFile.py 文件源码

def __init__(self, file, start):
        assert hasattr(file, 'read') and hasattr(file, 'tell') and hasattr(file, 'seek')
        assert isinstance(start, int)

        self.file, self.start = file, start
        self.total_len = total_len(file)
        self.len = self.total_len - start

        io.IOBase.__init__(self)

        try:
            self.seek(0)
        except:
            pass