test_pprint.py 文件源码

def test_knotted(self):
        # Verify .isrecursive() and .isreadable() w/ recursion
        # Tie a knot.
        self.b[67] = self.a
        # Messy dict.
        self.d = {}
        self.d[0] = self.d[1] = self.d[2] = self.d

        pp = pprint.PrettyPrinter()

        for icky in self.a, self.b, self.d, (self.d, self.d):
            self.assertTrue(pprint.isrecursive(icky), "expected isrecursive")
            self.assertFalse(pprint.isreadable(icky), "expected not isreadable")
            self.assertTrue(pp.isrecursive(icky), "expected isrecursive")
            self.assertFalse(pp.isreadable(icky), "expected not isreadable")

        # Break the cycles.
        self.d.clear()
        del self.a[:]
        del self.b[:]

        for safe in self.a, self.b, self.d, (self.d, self.d):
            # module-level convenience functions
            self.assertFalse(pprint.isrecursive(safe),
                             "expected not isrecursive for %r" % (safe,))
            self.assertTrue(pprint.isreadable(safe),
                            "expected isreadable for %r" % (safe,))
            # PrettyPrinter methods
            self.assertFalse(pp.isrecursive(safe),
                             "expected not isrecursive for %r" % (safe,))
            self.assertTrue(pp.isreadable(safe),
                            "expected isreadable for %r" % (safe,))