limit how much data is read with numpy.genfromtxt for matplotlib

Question

I am creating a graph in python using a text file for the source data and matplotlib to plot the graph. The simple logic below works well.

But is there a way to get

Answer 1

No idea about numpy, but one possible solution would be to use the stringio class.

That allows you to just load the data you actually need into a string with normal file IO (there's also a byte version), create a file-like object from the string and pass that to numpy.