You can use the __length_hint__() method stop the iter's loop. Like is:
while(extract<int>(my_iterable_obj.attr("__length_hint__")()) > 0):
{
...
}
This way can useful at list, tuple and as other Python's containter.
2006/11/11, Augusto Callejas
hi-
i'm writing a C++ class that i want to expose as a python class. one method in my class has an argument that takes in a python object that "implements" the iterator interface (that is the python object has defined "__iter__" and "__next__" and can be used in a "for x in y" loop).
how do i go about iterating over that python object in my C++ code?
for example:
void my_class::method(object my_iterable_obj) { // iterate over "my_iterable_obj" }
one method i tried was calling the "__next__" method explicity:
my_iterable_obj.attr("__next__")()
however, "__next__" raises a StopIteration exception when there are no more objects in the iterator. i could not find any examples in the boost python tutorials for handling python exceptions from c++.
is there another way i can go about this?
thanks, augusto.
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