[Python-bugs-list] [ python-Bugs-452252 ] __iadd__ sets object to None

[noreply@sourceforge.net]

Bugs item #452252, was opened at 2001-08-17 15:46
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=452252&group_id=5470

Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: John Shipman (shipman)
Assigned to: Nobody/Anonymous (nobody)
Summary: __iadd__ sets object to None

Initial Comment:
Here's my version info:

ActivePython 2.1, build 211 (ActiveState)
based on Python 2.1 (#1, Jun 15 2001, 02:52:41) 
[GCC 2.95.2 20000220 (Debian GNU/Linux)] on linux2

If I overload `+=' in a class using an __iadd__
method, the object is replaced by None.  Here's
a script that demonstrates the problem:

=====================================================
#!/usr/local/bin/python
#--
# iadd:  See if __iadd__ actually works
#--

class C:
    def __init__ ( self, value ):
        self.value  =  value

    def __str__ ( self ):
        return "C<%s>" % self.value

    def __repr__ ( self ):
        return str(self)

    def __iadd__ ( self, x ):
        self.value  =  self.value + x

# - - - - -   m a i n   - - - - -

c = C(37)
print "Before:", c

c += 10
print "Add 10:", c
=====================================================

And here's the output I get:

=====================================================
Before: C<37>
Add 10: None
=====================================================


----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=452252&group_id=5470