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from cython.cimports.libc.stdio import FILE, fopen
from cython.cimports.libc.stdlib import malloc, free
from cython.cimports.cpython.exc import PyErr_SetFromErrnoWithFilenameObject
def open_file():
p = fopen("spam.txt", "r") # The type of "p" is "FILE*", as returned by fopen().
if p is cython.NULL:
PyErr_SetFromErrnoWithFilenameObject(OSError, "spam.txt")
...
def allocating_memory(number=10):
# Note that the type of the variable "my_array" is automatically inferred from the assignment.
my_array = cython.cast(p_double, malloc(number * cython.sizeof(double)))
if not my_array: # same as 'is NULL' above
raise MemoryError()
...
free(my_array)
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