BUG/TST: Fix Excel writers with duplicated column names.#5237

Merged

jreback merged 1 commit intopandas-dev:masterfrom

jmcnamara:tst_excel_duplicated_cols

Oct 16, 2013

Commits on Oct 16, 2013

TST: Added test for Excel writers with duplicated column names.
jmcnamara
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