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    <p>Oh, looks like I misunderstood your question. Well, going the other direction isn't terribly different. This should be (as least a start of) the function you're looking for (I haven't tested it thoroughly though, so beware of the bugs):</p> <pre><code>// Returns a new reference PyObject *ObjcToPyObject(id object) { if (object == nil) { // This technically doesn't need to be an extra case, // but you may want to differentiate it for error checking return NULL; } else if ([object isKindOfClass:[NSString class]]) { return PyString_FromString([object UTF8String]); } else if ([object isKindOfClass:[NSNumber class]]) { // You could probably do some extra checking here if you need to // with the -objCType method. return PyLong_FromLong([object longValue]); } else if ([object isKindOfClass:[NSArray class]]) { // You may want to differentiate between NSArray (analagous to tuples) // and NSMutableArray (analagous to lists) here. Py_ssize_t i, len = [object count]; PyObject *list = PyList_New(len); for (i = 0; i &lt; len; ++i) { PyObject *item = ObjcToPyObject([object objectAtIndex:i]); NSCAssert(item != NULL, @"Can't add NULL item to Python List"); // Note that PyList_SetItem() "steals" the reference to the passed item. // (i.e., you do not need to release it) PyList_SetItem(list, i, item); } return list; } else if ([object isKindOfClass:[NSDictionary class]]) { PyObject *dict = PyDict_New(); for (id key in object) { PyObject *pyKey = ObjcToPyObject(key); NSCAssert(pyKey != NULL, @"Can't add NULL key to Python Dictionary"); PyObject *pyItem = ObjcToPyObject([object objectForKey:key]); NSCAssert(pyItem != NULL, @"Can't add NULL item to Python Dictionary"); PyDict_SetItem(dict, pyKey, pyItem); Py_DECREF(pyKey); Py_DECREF(pyItem); } return dict; } else { NSLog(@"ObjcToPyObject() could not convert Obj-C object to PyObject."); return NULL; } } </code></pre> <p>You may also want to take a look at the <a href="http://docs.python.org/c-api/index.html" rel="nofollow noreferrer">Python/C API Reference manual</a> if you haven't already.</p>
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    1. POHow to convert an NSDictionary to a Python dict?
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    1. USMichael Sanders
    1. USMichael Sanders
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    1. COThanks Michael! I looked through the C API before I posted the question, but I couldn't figure out how to leverage the PyDict methods with Objective-C NS objects (still dusting off my C; been a while since I had to think about pointers and so forth). Thanks for the starting code!
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