Cython performance benchmark vs pure python

benchmark.py

import cybubble
import pybubble
from timeit import default_timer as timer
from decimal import *
import random
import copy
getcontext().prec = 8

if __name__ == '__main__':
    random_list = [random.randrange(0,10) for i in range(9999)]
    random_list2 = copy.copy(random_list)
    random_list3 = copy.copy(random_list)


    cy_start = timer()
    cybubble.bubble_sort(random_list2)
    cy_end = timer()

    py_start = timer()
    pybubble.bubble_sort(random_list3)
    py_end = timer()


    print ("Python execution time:")
    python = (Decimal(py_end) - Decimal(py_start))
    print (python)

    print ("Cython execution time:")
    cython = (Decimal(cy_end) - Decimal(cy_start))
    print (cython)

    print ("Cython is "+ str(python/cython) +" x faster than pure python")

cybubble.pyx

cpdef bubble_sort(collection):
    cdef int length
    cdef int i
    cdef int j
    length = len(collection)
    for i in range(length-1):
        swapped = False
        for j in range(length-1-i):
            if collection[j] > collection[j+1]:
                swapped = True
                collection[j], collection[j+1] = collection[j+1], collection[j]
        if not swapped:
            break  # Stop iteration if the collection is sorted.
    return collection

pybubble.py

def bubble_sort(collection):
    length = len(collection)
    for i in range(length-1):
        swapped = False
        for j in range(length-1-i):
            if collection[j] > collection[j+1]:
                swapped = True
                collection[j], collection[j+1] = collection[j+1], collection[j]
        if not swapped:
            break  # Stop iteration if the collection is sorted.
    return collection

setup.py

# several files with ext .pyx, that i will call by their name
from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

ext_modules=[
    Extension("cybubble",       ["cybubble.pyx"]),
]

setup(
  name = 'MyProject',
  cmdclass = {'build_ext': build_ext},
  ext_modules = ext_modules,
)

Command to compile cython code:
python setup.py build_ext --inplace

Command to execute the benchmark script:
python benchmark.py

Result:
Python execution time:
9.1040399
Cython execution time:
1.6505609
Cython is 5.5157249 x faster than pure python