tarfile.py 文件源码

def next(self):
        """Return the next item using TarFile's next() method.
           When all members have been read, set TarFile as _loaded.
        """
        # Fix for SF #1100429: Under rare circumstances it can
        # happen that getmembers() is called during iteration,
        # which will cause TarIter to stop prematurely.
        if not self.tarfile._loaded:
            tarinfo = self.tarfile.next()
            if not tarinfo:
                self.tarfile._loaded = True
                raise StopIteration
        else:
            try:
                tarinfo = self.tarfile.members[self.index]
            except IndexError:
                raise StopIteration
        self.index += 1
        return tarinfo

# Helper classes for sparse file support