Showing content from http://svn.python.org/projects/python/branches/ctypes-branch/Lib/ctypes/test/test_struct_fields.py below:
import unittest from ctypes import * class StructFieldsTestCase(unittest.TestCase): # Structure/Union classes must get 'finalized' sooner or # later, when one of these things happen: # # 1. _fields_ is set. # 2. An instance is created. # 3. The type is used as field of another Structure/Union. # 4. The type is subclassed # # When they are finalized, assigning _fields_ is no longer allowed. def test_1_A(self): class X(Structure): pass self.failUnlessEqual(sizeof(X), 0) # not finalized X._fields_ = [] # finalized self.assertRaises(AttributeError, setattr, X, "_fields_", []) def test_1_B(self): class X(Structure): _fields_ = [] # finalized self.assertRaises(AttributeError, setattr, X, "_fields_", []) def test_2(self): class X(Structure): pass X() self.assertRaises(AttributeError, setattr, X, "_fields_", []) def test_3(self): class X(Structure): pass class Y(Structure): _fields_ = [("x", X)] # finalizes X self.assertRaises(AttributeError, setattr, X, "_fields_", []) def test_4(self): class X(Structure): pass class Y(X): pass self.assertRaises(AttributeError, setattr, X, "_fields_", []) Y._fields_ = [] self.assertRaises(AttributeError, setattr, X, "_fields_", []) if __name__ == "__main__": unittest.main()
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