[Python-bugs-list] [ python-Bugs-531355 ] coercian related - complex builtin

[noreply@sourceforge.net]

Bugs item #531355, was opened at 2002-03-18 09:32
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=531355&group_id=5470

Category: Python Interpreter Core
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Arthur Siegel (aj_siegel)
Assigned to: Nobody/Anonymous (nobody)
Summary: coercian related - complex builtin

Initial Comment:
I had presented this on tutor and python-list:

class Complex(complex):
    def __mul__(self,other):
       other=Complex(other)
       t = complex.__mul__(self,other)
       return Complex(t.real,t.imag)
    __rmul__ = __mul__

    def __add__(self,other):
       other=Complex(other)
       return Complex(self.real.__add__
(other.real),self.imag.__add__(other.imag))
    __radd__ = __add__

Then:

print type(Complex(5,4) * 7)
>><class '__main__.Complex'>
print type(7 * Complex(5,4))
>><class '__main__.Complex'>
print type(Complex(5,4) + 7)
>><class '__main__.Complex'>

But:

print type(7 + Complex(5,4))
>><type 'complex'>


Danny Yoo, after looking into it pretty deeply - 
and going to the docs and source gace me this
advice.

"In any case, this is definitely a bug in the 
documentation.  Arthur, bring
it up on comp.lang.python and Sourceforge again.  
Someone should really
look at your example, since it does seem serious... if 
not a little
obscure.  *grin*  "



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