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...

Emmanuel Charpentier

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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