Moved freeze_panes validation to io/excel.py (#15160)#15592

Closed

jeffcarey wants to merge 2 commits intopandas-dev:masterfrom

jeffcarey:enh-15160-touchup2

Commits on Mar 6, 2017

Moved freeze_panes validation to io/excel.py
jeffcarey
committed

Commits on Mar 7, 2017

Cleaned up freeze_panes validation code
jeffcarey
committed