[NumPy-Tickets] [NumPy] #1398: augmented assignment statements do not handle exceptions in object.__float__() correctly

[NumPy Trac]

#1398: augmented assignment statements do not handle exceptions in
object.__float__() correctly
----------------------------------------+-----------------------------------
 Reporter:  sebastian.walter@…          |       Owner:  somebody
     Type:  defect                      |      Status:  new     
 Priority:  normal                      |   Milestone:          
Component:  numpy.core                  |     Version:  devel   
 Keywords:                              |  
----------------------------------------+-----------------------------------
 Best explained at an example:

 {{{
 import numpy

 print 'numpy.__version__ = ',numpy.__version__

 class adouble:

     def __init__(self,x):
         self.x = x

     def __mul__(self,other):
         if not isinstance(other, self.__class__):
             return self.__class__(self.x * other)
         return self.__class__(self.x * other.x)

     def __rmul__(self,other):
         return self * other

     def __float__(self):
         raise Exception('this is not possible')

     def __str__(self):
         return str(self.x)

 x = numpy.array([adouble(1.), adouble(2.), adouble(3.)])
 y = numpy.array([4.,5.,6.])

 # this should call the __float__ method of adouble which would raise an
 Exception
 # but it does not!
 y *= x
 }}}

 Output:
 {{{
 b45ch1@shlp:~/workspace/numpy_bugs$ python
 bug_casting_from_object_to_dtype_issue.py
 numpy.__version__ =  1.5.0.dev
 }}}

-- 
Ticket URL: <http://projects.scipy.org/numpy/ticket/1398>
NumPy <http://projects.scipy.org/numpy>
My example project