...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Q: I have exported my class to
python, with many overloaded operators. it works fine for me except the
*= operator. It always tells
me "can't multiply sequence with non int type". If I use
p2, it successfully executes my
code. What's wrong with me?
A: There's nothing wrong with you. This is a bug in Python 2.2. You can see the same effect in Pure Python (you can learn a lot about what's happening in Boost.Python by playing with new-style classes in Pure Python).
>>> class X(object): ... def __imul__(self, x): ... print 'imul' ... >>> x = X() >>> x *= 1
To cure this problem, all you need to do is upgrade your Python to version 2.2.1 or later.