cython

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def test_ptr():
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    """
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    >>> test_ptr()
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    False
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    """
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    cdef void* p = NULL
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    if p:
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        return True
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    else:
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        return False
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def test_ptr2():
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    """
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    >>> test_ptr2()
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    2
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    """
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    cdef char* p1 = NULL
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    cdef char* p2 = NULL
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    p1 += 1
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    if p1 and p2:
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        return 1
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    elif p1 or p2:
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        return 2
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    else:
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        return 3
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def test_int(int i):
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    """
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    >>> test_int(0)
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    False
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    >>> test_int(1)
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    True
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    """
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    if i:
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        return True
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    else:
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        return False
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def test_short(short i):
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    """
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    >>> test_short(0)
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    False
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    >>> test_short(1)
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    True
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    """
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    if i:
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        return True
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    else:
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        return False
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def test_Py_ssize_t(Py_ssize_t i):
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    """
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    >>> test_Py_ssize_t(0)
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    False
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    >>> test_Py_ssize_t(1)
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    True
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    """
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    if i:
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        return True
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    else:
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        return False
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cdef class TestExtInt:
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    cdef int i
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    def __init__(self, i): self.i = i
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def test_attr_int(TestExtInt e):
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    """
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    >>> test_attr_int(TestExtInt(0))
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    False
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    >>> test_attr_int(TestExtInt(1))
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    True
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    """
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    if e.i:
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        return True
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    else:
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        return False
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ctypedef union _aux:
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    size_t i
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    void *p
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cdef class TestExtPtr:
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    cdef void* p
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    def __init__(self, int i):
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        cdef _aux aux
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        aux.i = i
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        self.p = aux.p
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def test_attr_ptr(TestExtPtr e):
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    """
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    >>> test_attr_ptr(TestExtPtr(0))
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    False
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    >>> test_attr_ptr(TestExtPtr(1))
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    True
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    """
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    if e.p:
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        return True
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    else:
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        return False
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