[Python-ideas] Re: List .index() Method

index is meant to return the index of the first match it finds in the list from the beginning, it's most simpless implementation is: ``` for i, v in enumerate(self): if v == value: return i throw ValueError(f"Value '{value}' is not in list") ```` if you want the negative index, just subtract the list's length from the returned index: ``` res = listy.index(10) - len(listy) ```