bidihall at gmail
Aug 28, 2008, 10:17 PM
Post #1 of 5
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I have been trying to subclass complex, but I am not able to get the
right-hand arithmetic operators working.
As shown below, if an object of my subclass 'xcomplex' is added on the
right of a 'comlex' object, the type returned is 'complex', not
'xcomplex'.
I've tried subclassing float and it works fine (don't even need to
define __coerce__ in that case)
Is this a bug, or am I missing something?
Here's an example:
class xcomplex( complex ):
def __new__(cls,*args,**kwargs):
return complex.__new__(cls,*args,**kwargs)
def __coerce__(self,other):
t = complex.__coerce__(self,other)
try:
return (self,xcomplex(t[1]))
except TypeError:
return t
def __add__(self,x):
return xcomplex( complex.__add__(self,x) )
def __radd__(self,x):
return xcomplex( complex.__radd__(self,x) )
xz = xcomplex(1+2j)
xy = float(10.0)
z = complex(10+1j)
print type(xz + z) # OK: get xcomplex
print type(xz + xy) # OK: get xcomplex
print type(xz + 10) # OK: get xcomplex
print type(xy + xz) # OK: get xcomplex
print type(10 + xz) # OK: get xcomplex
print type(z + xz) # fails: get complex
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