About the KeyError '64' / 有关KeyError 64的问题

[pkuliyi2015]

English
I'm sorry that I couldn't replicate this error on my device. So I'm writing to welcome you who understand python debugging (for example, breakpoint() ) to fix the problem.

Chinese
我很抱歉在自己的机器上不能复现这个错误，因此特欢迎各位出现了报错，又懂得python调试（比如会用breakpoint()）的大佬看看是怎么回事，我来做对应的修复。