Executing a python script (way to long to include here) I wrote leads to a warning message. I don't know at which line in my code this gets raised. How can I get this information?

Furthermore, what does this mean exactly? In fact, I didn't know I was using a masked array of some sort?

/usr/lib/pymodules/python2.7/numpy/ma/core.py:3785: UserWarning: Warning: converting a masked element to nan.
warnings.warn("Warning: converting a masked element to nan.")
python numpy
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