the indicator EMA seems not right----compare with Talib.py

[TerryNanshan2]

Hi, could you help me to explain the below situation. And, if I want to get the same result with Python，what should I do?

talib.js

python version

[WaiSiuKei]

It is because the js code incorrectly passed length value as index value :
https://github.com/hackape/talib.js/blob/main/src/index.ts#L177-L192