IndexError: pop from empty list

[Gary Herron]

On 05/15/2014 09:36 PM, chris at freeranger.com wrote:
> Any ideas about what this might mean?
>
> Running Debian Wheezy on a RaspBerry Pi and collecting data on a dispatch thread that is reading input on the serial port (connected to xbee series 1).
>
> It happens every few days but it really chokes the program.
>
> Thanks for any tips,
> ChrisJ
>
>
>
>
> Exception in thread Thread-2:
> Traceback (most recent call last):
>    File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
>      self.run()
>    File "/usr/local/lib/python2.7/dist-packages/xbee/base.py", line 95, in run
>      self._callback(self.wait_read_frame())
>    File "/usr/local/lib/python2.7/dist-packages/xbee/base.py", line 400, in wait_read_frame
>      return self._split_response(frame.data)
>    File "/usr/local/lib/python2.7/dist-packages/xbee/base.py", line 288, in _split_response
>      info[parse_rule[0]] = parse_rule[1](self, info)
>    File "/usr/local/lib/python2.7/dist-packages/xbee/ieee.py", line 117, in <lambda>
>      lambda xbee,original: xbee._parse_samples(original['samples'])
>    File "/usr/local/lib/python2.7/dist-packages/xbee/base.py", line 357, in _parse_samples
>      digital_data_set = (sample_bytes.pop(0) << 8 | sample_bytes.pop(0))
> IndexError: pop from empty list

The error means that sample_bytes is an empty list so calling pop is an 
error.

Or were you asking something deeper, like *why*  sample_bytes is an 
empty list?

Gary Herron