<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def plotChIds(self, maptype=None, modout=False):
 """Print the channel numbers on the plotting display Note: --------- This method will behave poorly if you are plotting in mixed projections. Because the channel vertex polygons are already projected using self.defaultMap, applying this function when plotting in a different reference frame may cause trouble. """

        if maptype is None:
            maptype = self.defaultMap

        polyList = self.getAllChannelsAsPolygons(maptype)
        for p in polyList:
            p.identifyModule(modout=modout)