Many warning messages are currently being issued every time the
offending code is being run, instead of only the first time:
sage: C = codes.RandomLinearCode(4, 2, GF(2))
sage: C.decode(C.ambient_space().random_element())
/home/jsrn/local/sage/sage-6.3/src/bin/sage-ipython:1: DeprecationWarning:
decode is deprecated and will be removed from sage soon. Please call
decode_to_code instead
See http://trac.sagemath.org/18813 for details.
#!/usr/bin/env python
(1, 0, 1, 1)
sage: C.decode(C.ambient_space().random_element())
/home/jsrn/local/sage/sage-6.3/src/bin/sage-ipython:1: DeprecationWarning:
decode is deprecated and will be removed from sage soon. Please call
decode_to_code instead
See http://trac.sagemath.org/18813 for details.
#!/usr/bin/env python
(0, 0, 1, 0)
...
I was under the impression that deprecation warning messages should only
be issued the first time? I tried some other places in Sage and some
deprecation warnings act as above, while others issue a message only the
first time:
sage: random_matrix(CFF, 2)
/home/jsrn/local/sage/sage-6.3/local/lib/python2.7/site-packages/sage/rings/contfrac.py:298:
DeprecationWarning: CFF (ContinuedFractionField) is deprecated, use QQ instead
See http://trac.sagemath.org/20012 for details.
[ [0] [6]]
[[-5] [0]]
sage: random_matrix(CFF, 2)
[ [-2] [0; 2]]
[[-1; 1, 2] [-1]]
I tried to understand why the code above issues the warning only once,
but I failed.
A related warning is that of @experimental. It seems that if one uses
@experimental in the __init__ of a class, then a FutureWarning message
is issued every time an element of that class is constructed. Needless
to say, this is unnecessary noise for both users and in doctests (every
single doctests should include the warning).
At first I was extremely puzzled by the fact that the asymptotic_ring
code uses @experimental but doesn't have this doc-test problem: but then
I realised that all their experimental classes inherit from
UniqueRepresentation, so objects are instantiated only once for a set of
input. And the module doc string includes explicit @experimental-warning
tests that instantiate the cases used in the later doc tests.
But that doesn't work for classes that *don't* inherit from
UniqueRepresentation. What to do for them? The current @experimental is
so annoying as to be useless.
Best,
Johan
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