raise KeyError(key) from err

我想要用matplolib画图，读入excel的文件。结果提示raise KeyError(key) from err
KeyError: '日期'

可以参考该回答
https://ask.csdn.net/questions/7644527?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522165815792116781647538737%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=165815792116781647538737&biz_id=4&utm_medium=distribute.pc_search_result.none-task-ask_topic-2~all~first_rank_ecpm_v1~rank_v31_ecpm-1-7644527-null-null.142^v32^control,185^v2^tag_show&utm_term=matplolib%E7%94%BB%E5%9B%BEraise%20KeyError%28key%29%20from%20err%20KeyError%3A%20%20%E6%97%A5%E6%9C%9F&spm=1018.2226.3001.4187