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 have numpy.gentfromtxt only read the first 50 lines from the file 'temperature_logging'? Currently it reads the entire file.

temp = numpy.genfromtxt('temperature_logging',dtype=None,usecols=(0))
time = numpy.genfromtxt('temperature_logging',dtype=None,usecols=(1))

dates = matplotlib.dates.datestr2num(time)

pylab.plot_date(dates,temp,xdate=True,fmt='b-')

pylab.savefig('gp.png')

contents in temperature_logging;

21.75 12-01-2012-15:53:35    
21.75 12-01-2012-15:54:35    
21.75 12-01-2012-15:55:35    
.
.
.
python numpy matplotlib
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