[Python-Dev] In-place multiply and new style classes

[Todd Miller]

Hi,

I'm Todd Miller and I work at the Space Telescope Science Institute on 
Numarray.  
Numarray is STSCI's stab at improving Numeric.  This is my first post here.

Today one of the guys in my branch  noticed that Numarray's in-place 
multiply was
raising this bizarre exception:

--> a = ones ((5,), Float32)
--> a
array([1., 1., 1., 1., 1.], type=Float32)
--> a *= 62.
Traceback (innermost last):
  File "<console>", line 1, in ?
TypeError: can't multiply sequence to non-int


I looked into this for a couple hours and discovered the following:

class test1(object):
    """A new-style class"""
    def __init__(self):
        pass

    def __imul__(self, other):
        print "no luck here!"

>>> t1 = test1()
>>> t1 *= 62.
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: can't multiply sequence to non-int



Todd


-- 
Todd Miller 			jmiller@stsci.edu
STSCI / SSG			(410) 338 4576