from pylab import *
def f(t):
    d = 0.85
    k= 1.9
    et = (0.142*t+1.095)*(t+17.8)*k*d
    return et
t = arange(0.0, 35.0, 0.5)
plot(t, f(t))
ytext = ylabel('Evaporation')
xtext = xlabel('temperature')
setp(xtext, size='medium', name='courier', weight='bold', color='g')
setp(ytext, size='medium', name='helvetica', weight='light', color='b')
show()