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from libc.stdio cimport FILE, fopen
from libc.stdlib cimport malloc, free
from cpython.exc cimport PyErr_SetFromErrnoWithFilenameObject
def open_file():
cdef FILE* p
p = fopen("spam.txt", "r")
if p is NULL:
PyErr_SetFromErrnoWithFilenameObject(OSError, "spam.txt")
...
def allocating_memory(number=10):
cdef double *my_array = <double *> malloc(number * sizeof(double))
if not my_array: # same as 'is NULL' above
raise MemoryError()
...
free(my_array)
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