I have a signal which looks like this: add_history_row_signal = QtCore.pyqtSignal(int, int) The first int is a key for a dict, to retrieve a value. And in fact this int is the object id of a given object (i.e. id(my_object)). The connected method gets the int value ... but it is wrong, and the key is then not found in the dict. However, if I make the int used as a key smaller (losing the guarantee of uniqueness), it works OK: he_id_val = id(history_entry) % 10000 ... self.he_id_to_row_map[he_id_val] = [date_item, entry_item] self.add_history_row_signal.emit(he_id_val, len(history_list)) ... these 2 ints then come through OK to the connected method I could only think of 2 explanations for this: either there is a maximum value for the int key of a dict in Python (this doesn't appear to be the case as far as I can tell), or a pyqtSignal appears to impose some sort of "MAX INT" limitation. I have searched on this and found nothing. Obviously Qt is written in C++, and this max int value appears to be 2147483647. A typical value from id(x) in Python code is 1715560796288, so larger. Is there any known way to specify that a PyQt signal is using a C++ long rather than a C++ int? An obvious workaround is to convert this id value to a string. Just wondered if I can avoid this. Continue reading...
