How iterate (key, value) boost::python:dict

Question

How can I iterate in C++ over my boost::python:dict ? I need key and value in every loop round.

My try was this:

for (auto x : MyBoostPythonDict.iteritems())
{
    // determine key
    // determine value 
    // ...
}

I got this error: C3312 no callable 'end' function found for type 'boost::python::api::object'

Answer 1

You can simply loop over all key/value pairs as follows:

using namespace boost::python;

list items = MyBoostPythonDict.items();
for(ssize_t i = 0; i < len(items); ++i) {
    object key = items[i][0];
    object value = items[i][1];
    // ...
}

Now you need to extract the corresponding types from key and value. Assuming both are of type int you would use:

extract<int> key_int(key);
extract<int> value_int(value);

if (key_int.check() && value_int.check()) {
    cout << key_int << ": " << value_int << endl;
}