Thank you Vincent. this is much clearer.
It seems that I have some things left to understand about the Sage class
and types hierarchies. Sorry for the noise...
Le lundi 17 octobre 2016 13:55:14 UTC+2, vdelecroix a écrit :
> CDF is the name of a Python variable not a type.
> sage: a = CDF.an_element()
> sage: type(a)
> <type 'sage.rings.complex_double.ComplexDoubleElement'>
> You need to use this ComplexDoubleElement to type your function.
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