Python - 索引列表中的元素

I am a new Python programmer and trying some stuff out. I want to create a list of strings and loop through my list to check the size of each element, if the size is greater than 5, then I will change that string into an uppercase string. I am stuck on how to access that element. Below is some of the code that I have written. Thank you in advance!I am a new Python programmer and trying some st