avasilkov

def play_cycle(self):
    if self.busy:
        return

    self.busy = True

    x1 = self.ax[0].get_xlim()
    self.ax[0].set_xlim([x1[0] + 1, x1[1] + 1])

    #pops two candle lines

avasilkov

def xtick_formatter(x, fmt, td, p):
    res = None
    if x < p[-1][0]:
        res = (p[-1][1] + (x - p[-1][0]) * td).strftime(fmt)
    else:
        #it's reversed
        for i in p:
            if i[0] <= x:
                res = (i[1] + (x - i[0]) * td).strftime(fmt)
                break