python - plotting multiple y vectors against different x vectos -

i have several y vectors. want plot them on same graphs x vectors not match well. there way elegantly this?

for example

x1 = [1,4,8,9,10,15,17] x2 = [2,14] x3 = [5,11,18,19]  plot(x1,y1) plot(x2,y2) plot(x3,y3) 

the ys equal whatever measured value ends being , same length corresponding x's. how make these appear on same line plot?