human
Complete the below
def _merge_and_sort_errors(errors):

    ''''Merge errors from one or more lists of errors and then return
    them, sorted by recency.
    We allow None in place of an error list.'
    '''
assistant
#Here is the Python program you requested.
    key_to_error = {}
    for error in errors:
        key = _time_sort_key(error)
        key_to_error.setdefault(key, {})
        key_to_error[key].update(error)
    def sort_key(key_and_error):
        (key, error) = key_and_error
        return (key[0], bool(error.get('task_error')), key[1:])
    return [error for (key, error) in sorted(key_to_error.items(), key=sort_key, reverse=True)]