Paul R. Krugman
input = input[:index] + chr(char) + input[index:]
。业内人士推荐搜狗输入法下载作为进阶阅读
公式： f(x)=x⋅Φ(x)≈0.5x(1+tanh[2/π(x+0.044715x3)])
What happens after Benedict Bridgerton (Luke Thompson) asks Sophie Baek (Yerin Ha) to be his mistress? And will he ever put two and two together and realize she is his beloved Lady in Silver? This week, we finally find out.