play around with cython

cython_test.pyx

@@ -0,0 +1,16 @@
+def say_hello_to(name):
+  print("Hello %s!" % name)
+
+from math import sin
+
+def f(double x):
+    return sin(x**2)
+
+def integrate_f(double a, double b, int N):
+    cdef int i
+    cdef double s, dx
+    s = 0
+    dx = (b-a)/N
+    for i in range(N):
+        s += f(a+i*dx)
+    return s * dx