摘要: 1.>>>a = 1/2/2 >>>a >>>0.25 2.def plotMidText(cntrPt,parentPt,txtString): #在父子节点间填充文本信息 xMid = (parentPt[0]-cntrPt[0])/2.0 + cntrPt[0] yMid = (parentP 阅读全文