python3不兼容pyth
python 2和python 3相互
python 3.x与python 2.x
python2兼容python3的语
python2可以兼容python3的程
python3和python2能共
python2.x和python3.x语法不完全
python3.x与2.x兼
python3.8不
python2x和python3x兼
