'Unsubscribes the price handler from a current ticker symbol.'

def unsubscribe_ticker(self, ticker):

    try:
        self.tickers.pop(ticker, None)
        self.tickers_data.pop(ticker, None)
    except KeyError:
        print(('Could    not    unsubscribe    ticker    %s    as    it    was    never    subscribed.' % ticker))
