[Python-Dev] Shorter float repr in Python 3.1? (original) (raw)

Ned Deily nad at acm.org
Tue Apr 14 10:45:51 CEST 2009

In article <nad-D10AA9.19075613042009 at news.gmane.org>, Ned Deily <nad at acm.org> wrote:

In article <49E3D34E.8040705 at trueblade.com>, Eric Smith <eric at trueblade.com> wrote: > Before then, if anyone could build and test the py3k-short-float-repr > branch on any of the following machines, that would be great: > [...] > Something bigendian, like a G4 Mac

I'll crank up some OS X installer builds and run them on G3 and G4 Macs vs 32-/64- Intel. Any tests of interest beyond the default regttest.py?

FIrst attempt was a fat (32-bit i386 and ppc) build on 10.5 targeted for 10.3 and above; this is the similar to recent python.org OSX installers.
The good news: on 10.5 i386, running the default regrtest, no signficant differences were noted from an installer built from the current main py3k head.

Bad news: the same build installed on a G4 running 10.5 hung hard in test_pow of test_builtin; a kill was needed to terminate python. Same results on a G3 running 10.4.

nad at pbg4:/Library/Frameworks/Python.framework/Versions/3.1$ bin/python -S lib/python3.1/test/regrtest.py -s -v test_builtin test_builtin test_abs (test.test_builtin.BuiltinTest) ... ok test_all (test.test_builtin.BuiltinTest) ... ok test_any (test.test_builtin.BuiltinTest) ... ok test_ascii (test.test_builtin.BuiltinTest) ... ok test_bin (test.test_builtin.BuiltinTest) ... ok test_callable (test.test_builtin.BuiltinTest) ... ok test_chr (test.test_builtin.BuiltinTest) ... ok test_cmp (test.test_builtin.BuiltinTest) ... ok test_compile (test.test_builtin.BuiltinTest) ... ok test_delattr (test.test_builtin.BuiltinTest) ... ok test_dir (test.test_builtin.BuiltinTest) ... ok test_divmod (test.test_builtin.BuiltinTest) ... ok test_eval (test.test_builtin.BuiltinTest) ... ok test_exec (test.test_builtin.BuiltinTest) ... ok test_exec_redirected (test.test_builtin.BuiltinTest) ... ok test_filter (test.test_builtin.BuiltinTest) ... ok test_general_eval (test.test_builtin.BuiltinTest) ... ok test_getattr (test.test_builtin.BuiltinTest) ... ok test_hasattr (test.test_builtin.BuiltinTest) ... ok test_hash (test.test_builtin.BuiltinTest) ... ok test_hex (test.test_builtin.BuiltinTest) ... ok test_id (test.test_builtin.BuiltinTest) ... ok test_import (test.test_builtin.BuiltinTest) ... ok test_input (test.test_builtin.BuiltinTest) ... ok test_isinstance (test.test_builtin.BuiltinTest) ... ok test_issubclass (test.test_builtin.BuiltinTest) ... ok test_iter (test.test_builtin.BuiltinTest) ... ok test_len (test.test_builtin.BuiltinTest) ... ok test_map (test.test_builtin.BuiltinTest) ... ok test_max (test.test_builtin.BuiltinTest) ... ok test_min (test.test_builtin.BuiltinTest) ... ok test_neg (test.test_builtin.BuiltinTest) ... ok test_next (test.test_builtin.BuiltinTest) ... ok test_oct (test.test_builtin.BuiltinTest) ... ok test_open (test.test_builtin.BuiltinTest) ... ok test_ord (test.test_builtin.BuiltinTest) ... ok test_pow (test.test_builtin.BuiltinTest) ... ^CTerminated

Stepping through some of test_pow from the interactive interpreter:

Python 3.1a2+ (py3k-short-float-repr, Apr 13 2009, 20:55:35) [GCC 4.0.1 (Apple Inc. build 5490)] on darwin Type "help", "copyright", "credits" or "license" for more information.

pow(0,0) 1 <-- OK _pow(2,30)_ 1073741824 <-- OK _pow(0.,0)_ ^C^CTerminated <-- float argument => python hung in CPU loop, killed

Then I tried a couple of random floats:

Python 3.1a2+ (py3k-short-float-repr, Apr 13 2009, 20:55:35) [GCC 4.0.1 (Apple Inc. build 5490)] on darwin Type "help", "copyright", "credits" or "license" for more information.

3.1 -9.255965342383856e+61 1. ^C Terminated <-- kill needed

The same tests work fine on the intel Mac.

Just out of curiosity, I'll try to do the same build on the 10.4 ppc;
there are occasionally a few differences noted in the build results.
That won't be available until later today.

-- Ned Deily, nad at acm.org

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