type python fast

1def f(double x):
2    return x ** 2 - x
3
4
5def integrate_f(double a, double b, int N):
6    cdef int i
7    cdef double s, dx
8    s = 0
9    dx = (b - a) / N
10    for i in range(N):
11        s += f(a + i * dx)
12    return s * dx
13