python 3.x: "'str' does not support buffer interface"

Created by: bklaas

I commented on now closed issue 346 here https://github.com/onyxfish/csvkit/issues/346#issuecomment-63516330 but this seems to be a separate issue flushed out after that fix was implemented.

I am testing csvkit against both Python 2.7 and Python 3.4 using virtualenv and a top-of-tree git clone. So far everything seems fine (and fixed wrt issue 346) in 2.7, but I can't successfully run any commands in 3.4.

Error message appears to be generating directly from the spot of the new code for 346: (csvkit)[bklaas@bklaas csvkit]$ csvcut -c variable,label,rec usa_variables.csv 'str' does not support the buffer interface