Created attachment 679057 [details] Patch to correct this behaviour Description of problem: SerialException inherits from IOError but deosn't provide errno. How reproducible: Allways Steps to Reproduce: from serial import Serial, SerialException try: Serial(port = "moo", baudrate = 1, timeout = 0.25) except SerialException as e: print e print e.errno Actual results: could not open port moo: [Errno 2] No such file or directory: 'moo' None Expected results: could not open port moo: [Errno 2] No such file or directory: 'moo' 2 Additional info: I've filled this to upstream tracker: http://sourceforge.net/tracker/?func=detail&aid=3600845&group_id=46487&atid=446302
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