[Python-bugs-list] [ python-Bugs-695651 ] complex_new does not always respect subtypes

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Bugs item #695651, was opened at 2003-03-01 08:18
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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=695651&group_id=5470

Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Greg Chapman (glchapman)
Assigned to: Nobody/Anonymous (nobody)
Summary: complex_new does not always respect subtypes

Initial Comment:
On comp.lang.python, David Mertz pointed out this:

>>> class ComplexSub(complex): pass
... 
>>> c = ComplexSub(1+1j)
>>> type(c)
<type 'complex'>

In other words, trying to create a ComplexSub returns a 
complex.  The problem appears to be this check in 
complex_new:

 /* Special-case for single argumet that is already 
complex */ 
           if (PyComplex_CheckExact(r) && i == NULL) { 

I believe the above should also check to see if the type 
parameter is exactly complex:

 /* Special-case for single argumet that is already 
complex */ 
           if (PyComplex_CheckExact(r) && i == NULL && 
PyComplex_CheckExact(type)) { 


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>Comment By: Greg Chapman (glchapman)
Date: 2003-03-01 08:27

Message:
Logged In: YES 
user_id=86307

Oops, obviously that check should be ;

if (PyComplex_CheckExact(r) && i == NULL && 
 type == &PyComplex_Type) {

 


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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=695651&group_id=5470