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How do I force Python to interpret a number as a two's complement negative? Let me give you the background: I'm reading and writing a bunch of data over a serial port using the pyserial module. As the data is of arbitrary length I'm reading bytes into an array('B') untill I get a full packet, and then later interpreting the packet. My problem is that at some point I am reading in a 4 byte long int. As long as the int is positive everything is fine, but if it is negative, say 0xFFFFFFFF I get 4294967295 instead of -1. The code that is producing this looks like: self.AzNegLimitTxt.SetValue(str(data[3] << 24 | data[4] << 16 | data[5] << 8 | data[6])) Any ideas? |
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