The solution to "box 9" appears in pycharm

Just for the record, please skip it.

When the blogger was running the program, he did not know what keyboard he encountered. This appeared in pycharm

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Press ctrl 和 shift 和 9to solve


(Afterwards, it was found that the ctrl and shift and 9 of the keyboard were touched):

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Origin blog.csdn.net/weixin_41529093/article/details/112993014