#16969: Missing error message for WordMorphism
------------------------------------+------------------------
Reporter: nadialafreniere | Owner:
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-6.4
Component: PLEASE CHANGE | Resolution:
Keywords: error, Words | Merged in:
Authors: Nadia Lafrenière | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
The error message is consistent with what Python gives:
{{{
sage: D = {}
sage: D[0]
---------------------------------------------------------------------------
KeyError Traceback (most recent call
last)
<ipython-input-2-b088d10b34b5> in <module>()
----> 1 D[Integer(0)]
KeyError: 0
}}}
so I would close it as "invalid" (not a bug).
Interestingly, `KeyError` uses the `repr()` of its argument to show the
exception, while other exceptions use the `str()`, note the extra {{{'}}}
around the last `0`:
{{{
sage: raise ValueError("0")
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-5-eae8cf826a55> in <module>()
----> 1 raise ValueError("0")
ValueError: 0
sage: raise KeyError("0")
---------------------------------------------------------------------------
KeyError Traceback (most recent call
last)
<ipython-input-6-97c3d5eafb80> in <module>()
----> 1 raise KeyError("0")
KeyError: '0'
}}}
So I really think that `KeyError` is supposed to take as argument the
exact key which failed.
--
Ticket URL: <http://trac.sagemath.org/ticket/16969#comment:1>
Sage <http://www.sagemath.org>
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