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import random
from libc.stdlib cimport malloc, free
def random_noise(int number=1):
cdef int i
# allocate number * sizeof(double) bytes of memory
cdef double *my_array = <double *> malloc(number * sizeof(double))
if not my_array:
raise MemoryError()
try:
ran = random.normalvariate
for i in range(number):
my_array[i] = ran(0, 1)
# ... let's just assume we do some more heavy C calculations here to make up
# for the work that it takes to pack the C double values into Python float
# objects below, right after throwing away the existing objects above.
return [x for x in my_array[:number]]
finally:
# return the previously allocated memory to the system
free(my_array)
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