Integration of a function using quad from scipy

Example of integration of a function using scipy:

from scipy.integrate import quad

f = lambda x: 4-x*x # function to integrate
p = lambda x: (-x*x*x)/3 + 4*x # the primitive of f

# let's try to integrate f in the interval [0 2]
r = quad(f,0,2)   # integration using quad
r_analytic = p(2.0)-p(0.0) # analytic integration

print 'Results'
print r[0]
print r_analytic

Numerical and analytic result compared:

Results
5.33333333333
5.33333333333