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✏️ test_init.py

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from ctypes import *
import unittest

class X(Structure):
    _fields_ = [("a", c_int),
                ("b", c_int)]
    new_was_called = False

def __new__(cls):
        result = super(X, cls).__new__(cls)
        result.new_was_called = True
        return result

def __init__(self):
        self.a = 9
        self.b = 12

class Y(Structure):
    _fields_ = [("x", X)]

class InitTest(unittest.TestCase):
    def test_get(self):
        # make sure the only accessing a nested structure
        # doesn't call the structure's __new__ and __init__
        y = Y()
        self.assertEqual((y.x.a, y.x.b), (0, 0))
        self.assertEqual(y.x.new_was_called, False)

# But explicitly creating an X structure calls __new__ and __init__, of course.
        x = X()
        self.assertEqual((x.a, x.b), (9, 12))
        self.assertEqual(x.new_was_called, True)

y.x = x
        self.assertEqual((y.x.a, y.x.b), (9, 12))
        self.assertEqual(y.x.new_was_called, False)

if __name__ == "__main__":
    unittest.main()

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✏️ test_init.py