How worrying is this:
In 3.2.1 we have:
{{{
sage: K.<a>=QuadraticField(2310)
sage: C=K.class_group()
sage: I=C.0
sage: I^-1
AttributeError
...
AttributeError: 'FractionalIdealClass' object has no attribute 'is_one'
}}}
(cf #1052).
Now I add one line in sage/rings/number_field/class_group.py, namely I add
is_one = is_principal
inside the code for class FractionalIdealClass.
Result:
{{{
sage: K.<a>=QuadraticField(2310)
sage: C=K.class_group()
sage: I=C.0
sage: I^-1
/local/jec/sage-3.2.1.rc1/local/bin/sage-sage: line 202: 15960
Segmentation fault sage-ipython "$@" -p sage -i
}}}
I did not think that adding one line pf python code could do that....
John
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