During making sierpinski triangle why we take ‘0’ along with plt.plot( a1,b1,’0′)in last line?
the ‘o’ is the marker style and shows the shape in which our points are displayed. ‘o’ stands for circle, so each data point we plot takes the form of a blue circle.
Apart from a circle, you can choose ‘.’ for point or ‘-‘ for a horizontal line. Here is the complete list of options, if you want to check it out: