find uppercase algorithem

Question

I'm trying to find the first uppercase letter in a given string, I tried this code

def recursive_find_algorithem(str):
    if str[0].isupper():
        return str[0]
    else:
        try:
            recursive_find_algorithem(str[1:])
        except IndexError:
            return "no uppercase found"

but it works only when the uppercase letter is the first letter and returns "None" otherwise