在[Python-100-Days](https://github.com/jackfrued/Python-100-Days/tree/master)/[Day01-20](https://github.com/jackfrued/Python-100-Days/tree/master/Day01-20) /03.Python语言中的变量.md中 print(chr(a)) # int类型的100转成str,输出'd' 这一句话有问题,chr 里面只能放整数,为啥写了 a