Bug or feature json Python?

Question

Python

def get_group(name):
    for group in data:
        try:
            return group[name]
        except:
            pass

In data I store json.loads of a large file.
That's how it works. But if you put return False instead of a pass at the end, does it return False all the time?
Who will explain why? At first I thought about a large json file, but the problem turned out not to be in it, but just in the except place. Who will explain why?