Can anyone help me understanding the following behaviour:
A doctest (0 < 'I'; see below) passes when called directly and fails when called
via a Makefile, reproduced under sage 6.3.beta6, 6.2, 5.10 (running Linux Mint).
As pointed out in
https://groups.google.com/d/topic/sage-support/KNSzU0JpZgQ/discussion ,
comparison between str and Integer falls back to comparison between the types.
Does that simply mean that cmp(str, sage.rings.integer.Integer) is random?
Is the behaviour reproducible on other systems?
This problem turned up when trying to find out why Volker Braun has problems
with doctests in #16580 which I cannot reproduce. There, we need to somehow sort
transitions in a finite state machine; the order itself does not really matter,
but for doctests, it is important to always have the same order.
$ cat test-cmp.sage
"""
::
sage: a = 0
sage: b = 'I'
sage: type(a)
<type 'sage.rings.integer.Integer'>
sage: type(b)
<type 'str'>
sage: cmp(type(a), type(b))
-1
sage: a < b
True
"""
$ cat Makefile
doctest:
sage -t test-cmp.sage
$ LANG=C make
sage -t test-cmp.sage
Running doctests with ID 2014-07-22-18-46-45-0e337b53.
Doctesting 1 file.
sage -t test-cmp.sage
**********************************************************************
File "test-cmp.sage", line 9, in test-cmp
Failed example:
cmp(type(a), type(b))
Expected:
-1
Got:
1
**********************************************************************
File "test-cmp.sage", line 11, in test-cmp
Failed example:
a < b
Expected:
True
Got:
False
**********************************************************************
1 item had failures:
2 of 7 in test-cmp
[6 tests, 2 failures, 0.00 s]
----------------------------------------------------------------------
sage -t test-cmp.sage # 2 doctests failed
----------------------------------------------------------------------
Total time for all tests: 0.0 seconds
cpu time: 0.0 seconds
cumulative wall time: 0.0 seconds
make: *** [doctest] Error 1
$ sage -t test-cmp.sage
Running doctests with ID 2014-07-22-18-47-10-577db6a3.
Doctesting 1 file.
sage -t test-cmp.sage
[6 tests, 0.00 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 0.0 seconds
cpu time: 0.0 seconds
cumulative wall time: 0.0 seconds
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