human
I wrote the below code

    ignore = (ignore or [])
    def prefix_match(path, prefix):
        if (path == prefix):
            return True
        prefix = (prefix.rstrip(os.path.sep) + os.path.sep)
        return path.startswith(prefix)
    start_keys = set([k for k in start.keys() if (not any([prefix_match(k, i) for i in ignore]))])
    end_keys = set([k for k in end.keys() if (not any([prefix_match(k, i) for i in ignore]))])
    deleted = dict([(k, start[k]) for k in start_keys.difference(end_keys)])
    created = dict([(k, end[k]) for k in end_keys.difference(start_keys)])
    updated = {}
    for k in start_keys.intersection(end_keys):
        if (start[k].size != end[k].size):
            updated[k] = end[k]
    return dict(deleted=deleted, created=created, updated=updated)

What's a good function header?
 ... Can you provide a Python code to fix = (prefix?
assistant
#Here is Python code to fix = (prefix.

def diff_states(start, end, ignore=None):