Lib/ctypes/test/test_repr.py
from ctypes import *
import unittest

subclasses = []
for base in [c_byte, c_short, c_int, c_long, c_longlong,
        c_ubyte, c_ushort, c_uint, c_ulong, c_ulonglong,
        c_float, c_double, c_longdouble, c_bool]:
    class X(base):
        pass
    subclasses.append(X)

class X(c_char):
    pass

# This test checks if the __repr__ is correct for subclasses of simple types

class ReprTest(unittest.TestCase):
    def test_numbers(self):
        for typ in subclasses:
            base = typ.__bases__[0]
            self.assertTrue(repr(base(42)).startswith(base.__name__))
            self.assertEqual("<X object at", repr(typ(42))[:12])

    def test_char(self):
        self.assertEqual("c_char('x')", repr(c_char('x')))
        self.assertEqual("<X object at", repr(X('x'))[:12])

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