'implement function'

def func(self):

    if (not self.args):
        string = 'Usage:    @cwho    <channel>'
        self.msg(string)
        return
    channel = find_channel(self.caller, self.lhs)
    if (not channel):
        return
    if (not channel.access(self.caller, 'listen')):
        string = "You    can't    access    this    channel."
        self.msg(string)
        return
    string = '\n|CChannel    subscriptions|n'
    string += ('\n|w%s:|n\n        %s' % (channel.key, channel.wholist))
    self.msg(string.strip())
