Showing content from http://svn.python.org/projects/python/branches/ctypes-branch/Lib/ctypes/test/test_incomplete.py below:
import unittest from ctypes import * ################################################################ # # The incomplete pointer example from the tutorial # class MyTestCase(unittest.TestCase): def test_incomplete_example(self): lpcell = POINTER("cell") class cell(Structure): _fields_ = [("name", c_char_p), ("next", lpcell)] SetPointerType(lpcell, cell) c1 = cell() c1.name = "foo" c2 = cell() c2.name = "bar" c1.next = pointer(c2) c2.next = pointer(c1) p = c1 result = [] for i in range(8): result.append(p.name) p = p.next[0] self.failUnlessEqual(result, ["foo", "bar"] * 4) # to not leak references, we must clean _pointer_type_cache from ctypes import _pointer_type_cache del _pointer_type_cache[cell] ################################################################ if __name__ == '__main__': unittest.main()
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