I tried to create a PR for it, However, I don't know how to handle the code at https://github.com/python/cpython/blob/d4c76d960b/Lib/site.py#L159

So how to check UnicodeDecodeError when we just open the file, I use readlines() but it may use too many memory than before (I'm not sure it's important in this case).

    try:
        f = open(fullname, "r")
        data = f.readlines()
    except UnicodeDecodeError:
        f = open(fullname, "r", encoding="utf-8")
        data = f.readlines()