human
Complete the below
def checkHandleAndSynchronize(default=None):

    ''''Return the libtorrent handle if it\'s available, else return the default value.'
    '''
assistant
#Here is the Python code you requested.
    def wrap(f):
        def invoke_func(*args, **kwargs):
            download = args[0]
            with download.dllock:
                if (download.handle and download.handle.is_valid()):
                    return f(*args, **kwargs)
            return default
        return invoke_func
    return wrap