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from cpython.ref cimport PyObject
cdef extern from *:
ctypedef Py_ssize_t Py_intptr_t
python_string = "foo"
cdef void* ptr = <void*>python_string
cdef Py_intptr_t adress_in_c = <Py_intptr_t>ptr
address_from_void = adress_in_c # address_from_void is a python int
cdef PyObject* ptr2 = <PyObject*>python_string
cdef Py_intptr_t address_in_c2 = <Py_intptr_t>ptr2
address_from_PyObject = address_in_c2 # address_from_PyObject is a python int
assert address_from_void == address_from_PyObject == id(python_string)
print(<object>ptr) # Prints "foo"
print(<object>ptr2) # prints "foo"
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