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cimport cython
import time
 
cdef class Bench:
    cdef int n0
    def __init__(self):
        self.n0 = 0
 
    @cython.nonecheck(False)
    cdef int calc(self, int n):
        cdef int n1 = self.n0 + (1 - 2 * (n % 2))
        self.n0 = n
        return n1
 
def main():
    # Declaration
    cdef int i = 0
    cdef int n = 1
 
    # Instantiation
    obj_bench = Bench()
 
    # Main Process
    t1 = time.time()
    while i < 2147483647:
        n = obj_bench.calc(n)
        i += 1
    t2 = time.time()
    print("Cython\t-> %8.4f secs." %(t2 - t1))

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError: SyntaxError: ('invalid syntax', ('prog.py', 1, 14, 'cimport cython\n'))

Standard output is empty