Something

def main():
	xLight , yLight , xDark , yDark = xyList(testFile, 1.0, 1000.0)
	jvp = jvPlot()
	jvp.add_plotdata(xLight,yLight,label='Light')
	jvp.add_plotdata(xDark,yDark,label='Dark')
	jvp.set_title('This is my Plot')
	jvp.set_legend(True,columns=2)
	jvp.set_grid(True,'Red',':',0.5)
	jvp.set_xlabel('Voltage','V')
	jvp.set_ylabel('Current','mA cm$^{-2}$')
	jvp.set_xlim(-0.25,1)
	jvp.set_ylim(-12,5)
	jvp.set_axhline(0,3,'green',':')
	jvp.set_axvline(0,3,'pink','-')
	jvp.makePlot()
	return

main()