gh-56276: Add tests to test_compare

[csabella]

The part of the Maier-Panter bpo patch that hasn't been committed yet (doc changes were).

Contributed by: Andy Maier.
Contributed by: Martin Panter.

• Issue: Doc: remove errors about mixed-type comparisons. #56276

[matrixise]

Hello @csabella

What's the status of this PR?

Have a nice day

[csabella]

Hi @matrixise,

It hasn't been reviewed yet. I don't have any other updates.

[terryjreedy]

Merge conflicts were from test_compare part of #15167. Waiting for retest results.

On issue, Martin Panter said, after committing doc changes, "Someone needs to decide whether to use Andy’s tests as they are, or perhaps modify or drop some or all of them." Cheryl created this PR from the test part of the last .diff file and review is still needed.

[terryjreedy]

Tests that I presume once passed now fail due to improved constant constant folding and identity checking of results. The following now prints True & True in batch mode, whereas the tests below presume the opposite. (In interactive mode, where each line is compiled separately, they print false as matching constants requires that they be compiled together.) I think all the is not tests should be deleted. Only leave 'a is a' test and 'a is not b' where b is bound to a different constant.

test_binary_sequences (test.test_compare.ComparisonFullTest) ... FAIL
test_numbers (test.test_compare.ComparisonFullTest) ... FAIL
test_sequences (test.test_compare.ComparisonFullTest) ... FAIL

======================================================================
FAIL: test_binary_sequences (test.test_compare.ComparisonFullTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_compare.py", line 642, in test_binary_sequences
    self.assertIsNot(bs2, bs3, "Testcase error: bs2 is bs3")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: unexpectedly identical: b'b2' : Testcase error: bs2 is bs3

======================================================================
FAIL: test_numbers (test.test_compare.ComparisonFullTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_compare.py", line 516, in test_numbers
    self.assertIsNot(c2, c3, "Testcase error: c2 is c3")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: unexpectedly identical: (2+2j) : Testcase error: c2 is c3

======================================================================
FAIL: test_sequences (test.test_compare.ComparisonFullTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_compare.py", line 604, in test_sequences
    self.assertIsNot(t2, t3, "Testcase error: t2 is t3")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: unexpectedly identical: (2, 3) : Testcase error: t2 is t3

[arhadthedev]

Retriggering the latest test suit so everyone concerned has access to the failed logs.

[miss-islington]

Thanks @csabella for the PR, and @terryjreedy for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[miss-islington]

Thanks @csabella for the PR, and @terryjreedy for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-104694 is a backport of this pull request to the 3.11 branch.