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  • $\begingroup$ Thanks. I wouldn't have known what had caused it. I only know most of the time it's my work that's at fault :) $\endgroup$ Commented Jul 7, 2014 at 12:56
  • $\begingroup$ @elksie5000 : I have added how to debug the call. I hope the last call is what you would expect from a successful call to the function (?). Otherwise, it is always good to know how to step into the code with pdb :) $\endgroup$ Commented Jul 7, 2014 at 13:44
  • $\begingroup$ I must admit pdb was something I was looking at again after working through the Python for Data Analysis book by Wes McKinney. I already work in IPython, but had been reasonably happy with print statements. Thank you again. $\endgroup$ Commented Jul 7, 2014 at 15:03
  • $\begingroup$ As a side note, the debugger prompt says "ipdb" because it is the ipython debugger - this is an extra install in my setup. Under normal circumstances, it would be the regular pdb that is called. Just noticed this difference. $\endgroup$ Commented Jul 7, 2014 at 15:27