time=[ '2013-08','09','10','11','12','2014-01','02','03','04','05','06','07','08','09','10','11','12','2015-01','02','03','04','05','06','07']因为我画的图是以横坐标为时间的,要上边那种格式的就得用字符串了,pl.plot(time, videonum)pl.show()这个代码不行如何画出横坐标是字符串,纵坐标是数字的折线图?