[Python-Dev] About raising NotPortableWarning for CPython specific code

Sat Mar 12 22:25:24 CET 2011

On 3/12/2011 8:33 AM, Laura Creighton wrote:
> The thread with the whole gory details begins here:
> http://codespeak.net/pipermail/pypy-dev/2011q1/006958.html

The second, multiplication issue does appears to be the same issue.
Augmenting my previous test:
class C(object):
 def __iter__(self):
 yield 'yes!'
 def __radd__(self, other):
 other.append('bug!')
 return other
 def __rmul__(self, other):
 other *= 2
 return other
 def __index__(self):
 return 3
class L(list):
 def __iadd__(self, other):
 list.__iadd__(self,other)
 return self
 def __mul__(self, other):
 return L(list.__imul__(self,other))
z1, z2, c = [], L(), C()
z1 += c
z2 += c
print(z1, z2, [1]*c, L([1])*c)
 >>>
['bug!'] ['yes!'] [1, 1] [1, 1, 1] # PyPy prints ['yes!'], [1, 1, 1]
I opened http://bugs.python.org/issue11477
-- 
Terry Jan Reedy