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gh-111147: Fix test_set_of_sets_reprs in test_pprint (GH-111148)
Make it stable and not depending on implementation details.
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‎Lib/test/test_pprint.py

Lines changed: 95 additions & 197 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,6 @@
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import random
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import re
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import test.support
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import test.test_set
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import types
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import unittest
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@@ -623,9 +622,6 @@ def test_set_reprs(self):
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self.assertEqual(pprint.pformat(frozenset3(range(7)), width=20),
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'frozenset3({0, 1, 2, 3, 4, 5, 6})')
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@unittest.expectedFailure
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#See http://bugs.python.org/issue13907
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@test.support.cpython_only
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def test_set_of_sets_reprs(self):
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# This test creates a complex arrangement of frozensets and
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# compares the pretty-printed repr against a string hard-coded in
@@ -636,204 +632,106 @@ def test_set_of_sets_reprs(self):
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# partial ordering (subset relationships), the output of the
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# list.sort() method is undefined for lists of sets."
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#
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# In a nutshell, the test assumes frozenset({0}) will always
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# sort before frozenset({1}), but:
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#
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# >>> frozenset({0}) < frozenset({1})
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# False
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# >>> frozenset({1}) < frozenset({0})
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# False
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#
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# Consequently, this test is fragile and
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# implementation-dependent. Small changes to Python's sort
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# algorithm cause the test to fail when it should pass.
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# XXX Or changes to the dictionary implementation...
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cube_repr_tgt = """\
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{frozenset(): frozenset({frozenset({2}), frozenset({0}), frozenset({1})}),
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frozenset({0}): frozenset({frozenset(),
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frozenset({0, 2}),
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frozenset({0, 1})}),
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frozenset({1}): frozenset({frozenset(),
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frozenset({1, 2}),
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frozenset({0, 1})}),
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frozenset({2}): frozenset({frozenset(),
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frozenset({1, 2}),
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frozenset({0, 2})}),
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frozenset({1, 2}): frozenset({frozenset({2}),
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frozenset({1}),
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frozenset({0, 1, 2})}),
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frozenset({0, 2}): frozenset({frozenset({2}),
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frozenset({0}),
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frozenset({0, 1, 2})}),
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frozenset({0, 1}): frozenset({frozenset({0}),
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frozenset({1}),
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frozenset({0, 1, 2})}),
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frozenset({0, 1, 2}): frozenset({frozenset({1, 2}),
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frozenset({0, 2}),
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frozenset({0, 1})})}"""
675-
cube = test.test_set.cube(3)
676-
self.assertEqual(pprint.pformat(cube), cube_repr_tgt)
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cubo_repr_tgt = """\
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{frozenset({frozenset({0, 2}), frozenset({0})}): frozenset({frozenset({frozenset({0,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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1})}),
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frozenset({frozenset(),
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frozenset({0})}),
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frozenset({frozenset({2}),
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frozenset({0,
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2})})}),
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frozenset({frozenset({0, 1}), frozenset({1})}): frozenset({frozenset({frozenset({0,
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1}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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1})}),
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frozenset({frozenset({1}),
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frozenset({1,
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2})}),
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frozenset({frozenset(),
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frozenset({1})})}),
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frozenset({frozenset({1, 2}), frozenset({1})}): frozenset({frozenset({frozenset({1,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({2}),
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frozenset({1,
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2})}),
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frozenset({frozenset(),
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frozenset({1})}),
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frozenset({frozenset({1}),
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frozenset({0,
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1})})}),
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frozenset({frozenset({1, 2}), frozenset({2})}): frozenset({frozenset({frozenset({1,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({1}),
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frozenset({1,
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2})}),
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frozenset({frozenset({2}),
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frozenset({0,
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2})}),
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frozenset({frozenset(),
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frozenset({2})})}),
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frozenset({frozenset(), frozenset({0})}): frozenset({frozenset({frozenset({0}),
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frozenset({0,
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1})}),
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frozenset({frozenset({0}),
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frozenset({0,
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2})}),
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frozenset({frozenset(),
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frozenset({1})}),
738-
frozenset({frozenset(),
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frozenset({2})})}),
740-
frozenset({frozenset(), frozenset({1})}): frozenset({frozenset({frozenset(),
741-
frozenset({0})}),
742-
frozenset({frozenset({1}),
743-
frozenset({1,
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2})}),
745-
frozenset({frozenset(),
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frozenset({2})}),
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frozenset({frozenset({1}),
748-
frozenset({0,
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1})})}),
750-
frozenset({frozenset({2}), frozenset()}): frozenset({frozenset({frozenset({2}),
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frozenset({1,
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2})}),
753-
frozenset({frozenset(),
754-
frozenset({0})}),
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frozenset({frozenset(),
756-
frozenset({1})}),
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frozenset({frozenset({2}),
758-
frozenset({0,
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2})})}),
760-
frozenset({frozenset({0, 1, 2}), frozenset({0, 1})}): frozenset({frozenset({frozenset({1,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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1})}),
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frozenset({frozenset({1}),
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frozenset({0,
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1})})}),
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frozenset({frozenset({0}), frozenset({0, 1})}): frozenset({frozenset({frozenset(),
777-
frozenset({0})}),
778-
frozenset({frozenset({0,
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1}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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2})}),
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frozenset({frozenset({1}),
787-
frozenset({0,
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1})})}),
789-
frozenset({frozenset({2}), frozenset({0, 2})}): frozenset({frozenset({frozenset({0,
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2}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({2}),
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frozenset({1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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2})}),
800-
frozenset({frozenset(),
801-
frozenset({2})})}),
802-
frozenset({frozenset({0, 1, 2}), frozenset({0, 2})}): frozenset({frozenset({frozenset({1,
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2}),
804-
frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0,
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1}),
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frozenset({0,
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1,
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2})}),
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frozenset({frozenset({0}),
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frozenset({0,
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2})}),
815-
frozenset({frozenset({2}),
816-
frozenset({0,
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2})})}),
818-
frozenset({frozenset({1, 2}), frozenset({0, 1, 2})}): frozenset({frozenset({frozenset({0,
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2}),
820-
frozenset({0,
821-
1,
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2})}),
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frozenset({frozenset({0,
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1}),
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frozenset({0,
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1,
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2})}),
828-
frozenset({frozenset({2}),
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frozenset({1,
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2})}),
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frozenset({frozenset({1}),
832-
frozenset({1,
833-
2})})})}"""
834-
835-
cubo = test.test_set.linegraph(cube)
836-
self.assertEqual(pprint.pformat(cubo), cubo_repr_tgt)
640+
# In this test we list all possible invariants of the result
641+
# for unordered frozensets.
642+
#
643+
# This test has a long history, see:
644+
# - https://github.com/python/cpython/commit/969fe57baa0eb80332990f9cda936a33e13fabef
645+
# - https://github.com/python/cpython/issues/58115
646+
# - https://github.com/python/cpython/issues/111147
647+
648+
import textwrap
649+
650+
# Single-line, always ordered:
651+
fs0 = frozenset()
652+
fs1 = frozenset(('abc', 'xyz'))
653+
data = frozenset((fs0, fs1))
654+
self.assertEqual(pprint.pformat(data),
655+
'frozenset({%r, %r})' % (fs0, fs1))
656+
self.assertEqual(pprint.pformat(data), repr(data))
657+
658+
fs2 = frozenset(('one', 'two'))
659+
data = {fs2: frozenset((fs0, fs1))}
660+
self.assertEqual(pprint.pformat(data),
661+
"{%r: frozenset({%r, %r})}" % (fs2, fs0, fs1))
662+
self.assertEqual(pprint.pformat(data), repr(data))
663+
664+
# Single-line, unordered:
665+
fs1 = frozenset(("xyz", "qwerty"))
666+
fs2 = frozenset(("abcd", "spam"))
667+
fs = frozenset((fs1, fs2))
668+
self.assertEqual(pprint.pformat(fs), repr(fs))
669+
670+
# Multiline, unordered:
671+
def check(res, invariants):
672+
self.assertIn(res, [textwrap.dedent(i).strip() for i in invariants])
673+
674+
# Inner-most frozensets are singleline, result is multiline, unordered:
675+
fs1 = frozenset(('regular string', 'other string'))
676+
fs2 = frozenset(('third string', 'one more string'))
677+
check(
678+
pprint.pformat(frozenset((fs1, fs2))),
679+
[
680+
"""
681+
frozenset({%r,
682+
%r})
683+
""" % (fs1, fs2),
684+
"""
685+
frozenset({%r,
686+
%r})
687+
""" % (fs2, fs1),
688+
],
689+
)
690+
691+
# Everything is multiline, unordered:
692+
check(
693+
pprint.pformat(
694+
frozenset((
695+
frozenset((
696+
"xyz very-very long string",
697+
"qwerty is also absurdly long",
698+
)),
699+
frozenset((
700+
"abcd is even longer that before",
701+
"spam is not so long",
702+
)),
703+
)),
704+
),
705+
[
706+
"""
707+
frozenset({frozenset({'abcd is even longer that before',
708+
'spam is not so long'}),
709+
frozenset({'qwerty is also absurdly long',
710+
'xyz very-very long string'})})
711+
""",
712+
713+
"""
714+
frozenset({frozenset({'abcd is even longer that before',
715+
'spam is not so long'}),
716+
frozenset({'xyz very-very long string',
717+
'qwerty is also absurdly long'})})
718+
""",
719+
720+
"""
721+
frozenset({frozenset({'qwerty is also absurdly long',
722+
'xyz very-very long string'}),
723+
frozenset({'abcd is even longer that before',
724+
'spam is not so long'})})
725+
""",
726+
727+
"""
728+
frozenset({frozenset({'qwerty is also absurdly long',
729+
'xyz very-very long string'}),
730+
frozenset({'spam is not so long',
731+
'abcd is even longer that before'})})
732+
""",
733+
],
734+
)
837735

838736
def test_depth(self):
839737
nested_tuple = (1, (2, (3, (4, (5, 6)))))

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