Hello everyone,
here is a bug that is maybe related to coercion system to Integers in sage:
sage: W = Words(4)
sage: W([1,2])
word: 12
sage: W([1,2]) in QQ
False
sage: W([1,2]) in ZZ
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
<ipython-input-30-ef733470b649> in <module>()
----> 1 W([Integer(1),Integer(2)]) in ZZ
[...]
NotImplementedError: please implement _an_element_ for Words over {1, 2, 3,
4}
It is easy to fix by adding the _an_element_ method to W by doing:
sage: W._an_element_ = lambda : W()
sage: W([1,2]) in ZZ
False
but maybe is it hiding a more tricky problem behind ?
Aladin
PS: this post is in the continuity of a topic I originally opened on
sage-support:
https://groups.google.com/forum/#!topic/sage-support/uvKWkq7wDVM
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