亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

The indentation at the same level must be consistent, and a colon must be added after the conditional judgment. In addition, it is better to use elif directly. There is no need to nest another one to reduce execution efficiency. I suggest you watch the 600-episode tutorial of Dark Horse Programmer at Station B. That one is more detailed and standardized. The one by Little Turtle is not suitable for pure beginners.

Python’s indentation is also part of the syntax, which represents the hierarchical relationship between codes.

Judging that there is no need for spaces or tabs in front