TST: fix pyflakes error
TST: fix pyflakes error

cpcloud/ibis,cpcloud/ibis,koverholt/ibis,laserson/ibis,ibis-project/ibis,deepfield/ibis,ibis-project/ibis,laserson/ibis,wesm/ibis,wesm/ibis,cloudera/ibis,deepfield/ibis,cpcloud/ibis,mariusvniekerk/ibis,koverholt/ibis,wesm/ibis,cloudera/ibis,mariusvniekerk/ibis,deepfield/ibis,mariusvniekerk/ibis,ibis-project/ibis,koverholt/ibis,mariusvniekerk/ibis,ibis-project/ibis,laserson/ibis,koverholt/ibis,deepfield/ibis,laserson/ibis,cloudera/ibis,cpcloud/ibis