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%load_ext cythonmagic


    

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%%cython
def fib(int n):
    cdef int i, a, b
    a, b = 1, 1
    for i in range(n):
        a, b = a+b, a
    return a


    

In [3]:

    

%%cython
import cython
@cython.locals(n=cython.int)
def fib(n):
    cython.declare(i=cython.int,
                   a=cython.int,
                   b=cython.int)
    a,b = 1,1
    for i in range(n):
        a, b = a+b, a
    return a


    

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